ID 596

Statistics, Data Analysis and Probability K8In a survey of students, 2/3 of the girls and 3/4 of the boys preferred using pens over pencils.
Girls make up 60% of the students in the school.

What percent of the students prefer using pens?



ID 630

Statistics, Data Analysis and Probability K8A bag contains six green, five gray, and four violet disks.

If a disk is drawn at random from the bag, what is the probability that the disk drawn is green?



ID 631

Statistics, Data Analysis and Probability K8There are 16 pieces in a bag.

If you take one piece out of the bag without looking, which piece are you most likely to draw?



ID 635

Statistics, Data Analysis and Probability K8Mark tosses a dime three times in a row.
The tree diagram shows all possible outcomes.

What is the probability that Mark will toss two or more heads?



ID 656

Statistics, Data Analysis and Probability K8Thirty-three apples, or 11% of the total, were not sold.

How many apples were sold?



ID 679

Statistics, Data Analysis and Probability K8The US Census Bureau stated that 6,830,000,000 people lived in an area of 125,640,000 sq. km in 2010, or about 54 people per sq. km.
The population will be 9,200,000,000 in 2050.

How many people will live per square kilometer?



ID 684

Statistics, Data Analysis and Probability K8If 40% of a number is 44, what is 44% of that number?



ID 1063

Statistics, Data Analysis and Probability K8On the chessboard, what is the probability that a randomly chosen square is dark and does not touch the outer edge of the board?



ID 1156

Statistics, Data Analysis and Probability K8Which amount of money is the closest to the average of these numbers?



ID 1187

Statistics, Data Analysis and Probability K8The faces of a cube are numbered from 1 to 6.
I roll the cube once.
Which outcome is least likely to occur?



ID 1361

Statistics, Data Analysis and Probability K8Anna recorded the temperature every day for a week (7 days).
It was 22°C on Monday.
The temperature decreased by 2°C every day.

What was the average temperature for the week?



ID 1475

Statistics, Data Analysis and Probability K8The sum of 19 consecutive integer numbers is 2090.

What is the difference between the largest and the smallest of these numbers?



ID 1565

Statistics, Data Analysis and Probability K8Which scatter plot best shows the relationship between a person's height and the time that person spends playing computer games?



ID 1790

Statistics, Data Analysis and Probability K8The table shows the results of a competition among 5 teams.

How many teams received more points than the average?



ID 1843

Statistics, Data Analysis and Probability K8Each of four children chose one of these cards.
They multiplied the chosen numbers.

Which number cannot be the product of those numbers?



ID 1967

Statistics, Data Analysis and Probability K8Fifty-two percent of the households in Funnytown have children and twenty-five percent have pets.

What percent has both?



ID 2073

Statistics, Data Analysis and Probability K8What is the average number of stones in a column?



ID 2159

Statistics, Data Analysis and Probability K8I place 5 dominos face up on my table.
I have to get all the dominos facing down by flipping over three dominos in each move.
What is the minimum number of moves?



ID 2233

Statistics, Data Analysis and Probability K8On average there are 100,000 strands of hair on a person's head.
Hair grows at a rate of about 15cm a year and each hair lasts up to 6 years before it falls out.

If the population of London is 8,000,000, what is the probability that at least 2 of the inhabitants have the same number of hairs on their heads, discounting bald people?



ID 2942

Statistics, Data Analysis and Probability K8A school store's expenses and sales for a three-day period are shown in the table.

When the store's revenue was maximum?



ID 2956

Statistics, Data Analysis and Probability K8There are 16 pieces in a bag.

You are going to take one piece out of the bag without looking.

Which shape would you most likely draw?



ID 2961

Statistics, Data Analysis and Probability K8John's hourly wage increases from $8 to $12.

Find the percent of change.



ID 3065

Statistics, Data Analysis and Probability K8Tim received the following scores in the online math tests:

80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, and 90%

What was his average (mean) score?



ID 3093

Statistics, Data Analysis and Probability K8A week ago, Anna's jar was filled with 120 jellybeans.
She always took the jellybeans without looking into the jar.
Today, there are 11 green and 9 red.

Estimate the number of red jellybeans she has eaten.



ID 3200

Statistics, Data Analysis and Probability K8Which percentage of the shape is white?



ID 3281

Statistics, Data Analysis and Probability K8One person is chosen at random from the list.
What is the probability that his/her name contains the letter "a"?



ID 3294

Statistics, Data Analysis and Probability K8Into which set should 72 be placed?



ID 3322

Statistics, Data Analysis and Probability K8How many different ways can $50 be made using only $5 and $10 bills?



ID 3369

Statistics, Data Analysis and Probability K8Bobby writes each letter of his name on a separate card.
He randomly chooses one card.

What is the probability that the card is not an "B"?



ID 3398

Statistics, Data Analysis and Probability K8Figure out the sum of the four numbers:

41 32 23 14



ID 3418

Statistics, Data Analysis and Probability K8Fifty percent of Funnytown's households have children and 20% have pets.

If 10% have both, what percent have neither?



ID 3502

Statistics, Data Analysis and Probability K8A palindrome is a number whose value is equal in either direction.
 For example, 12321 is a five-digit palindrome.

How many five-digit palindromes exist?



ID 3522

Statistics, Data Analysis and Probability K8Order the shape by weight from lightest to heaviest.



ID 3547

Statistics, Data Analysis and Probability K8A bus carrying 5 tourists travels to Dogland. Every tourist has a dog. Every dog has 5 puppies. A dog has 5 toes on each paw.

How many toes are there in the tourist bus?



ID 3556

Statistics, Data Analysis and Probability K8The United States has currency notes in denominations of 1, 2 and 5.
How many ways are there to form exactly $10 using multiples of only these bills?



ID 3581

Statistics, Data Analysis and Probability K8Two friends and I have gone out to dinner. The bill comes to $150.00. Everybody agrees to tip $10.

What tip would we leave our server?


The photograph courtesy of Roland Sauter



ID 3582

Statistics, Data Analysis and Probability K8Alex and Bill both have some money.
Alex is short of two dollars and Bill of three dollars to buy a bird.
If they pool their money, they are still short of money.

How much does the bird cost?



ID 3585

Statistics, Data Analysis and Probability K8Alex likes 81 but not 82; he likes 49 but not 50, he likes 225 but not 224.
Which number does he like?



ID 3634

Statistics, Data Analysis and Probability K8The diagram shows my Saturday morning activities.

If I do only two activities at the same time how much time does it take?



ID 3682

Statistics, Data Analysis and Probability K8The diagram shows a road network.
All cars drive in one direction from A to B.
The numbers represent the maximum flow rate in vehicles per hour.

What is the maximum number of cars that can drive through the network every hour?



ID 3740

Statistics, Data Analysis and Probability K8There are two ways to add four odd numbers to get 8:

5 + 1 + 1 + 1 = 8
3 + 3 + 1 + 1 = 8

Changes in the order of numbers do not count as new solutions.

How many ways can you add four odd numbers to get 12?



ID 3783

Statistics, Data Analysis and Probability K8Carl Friedrich Gauss (1777-1855) is one of the world's most famous mathematicians.

When Gauss was about 9 years old, to make students busy for a long period of time, his teacher asked students to add the integers from 1 to 100.
While his classmates toiled away doing the addition longhand, Gauss immediately wrote the correct answer.

Can you do the same?



ID 3852

Statistics, Data Analysis and Probability K8Gerry sent three letters to three girlfriends.

The postman put the letters into three different boxes without looking at the name of the recipient.

What is the probability that all girls received their letters?



ID 3884

Statistics, Data Analysis and Probability K8How much does a sales representative earn from the sale of seven $50,000 cars if he receives a 2% commission?



ID 3981

Statistics, Data Analysis and Probability K8Find the sum of all the numbers in the pyramid if each number is the sum of the four numbers directly below it.



ID 4085

Statistics, Data Analysis and Probability K8If I lose 25% on an investment during the first year and gain 20% the following year, what is my net loss?



ID 4086

Statistics, Data Analysis and Probability K8There were 4,492,205 articles and 21,140,000 contributors in the English version of Wikipedia on Monday 14 April 2014.

What is the average number of articles written by each contributor?



ID 4144

Statistics, Data Analysis and Probability K8According to a study, hair grows about half a millimeter each day.

How much time does it take for Evguenia's hair to grow 1 meter (1000 millimeters) longer?



ID 4173

Statistics, Data Analysis and Probability K8The sum of Jim, John and Jane's ages is 27.

If the twin brothers are older than 7 and younger than their sister, how old is Jim?



ID 4175

Statistics, Data Analysis and Probability K8I decided to save a dollar in January, then increase the amount by one dollar each month.

How much will I save in a year?



ID 4180

Statistics, Data Analysis and Probability K8John has an average of 60 marks on his first Math tests.
He missed the last (fifth) test and got zero.

What is the average score now?

The question is typical for PISA Test.

PISA stands for Programme for International Student Assessment.



ID 4288

Statistics, Data Analysis and Probability K8A sundial (shadow clock) is a device that tells the time of day by the position of the Sun.

Find the sum on the sundial numbers.



ID 4338

Statistics, Data Analysis and Probability K8There are 5 children in a boat.
Four of them do one of the activities below.

What is the fifth kid doing?



ID 4406

Statistics, Data Analysis and Probability K8Once upon a time, there were three little pigs.
If two brothers weighed 45kg, what is the most probable weight of the third brother?



ID 4735

Statistics, Data Analysis and Probability K8Jane wants to make different bracelets.

Which bracelets are the same?



ID 4742

Statistics, Data Analysis and Probability K8A waiter receives 15% tips from each table in a restaurant.

What is the minimum order that allows him to reach his target of a $5 tip per table?



ID 4747

Statistics, Data Analysis and Probability K8Gerry puts 1/10 of his $50 weekly allowance in the bank for college.

How much does he save in a year if he gets the money every week including holidays?



ID 4823

Statistics, Data Analysis and Probability K8The sum of 11 consecutive integer numbers is 11.

What is the largest number?



ID 4941

Statistics, Data Analysis and Probability K8A puzzle used to cost $49.95 but now the price is $33.45.

How much is the discount?



ID 5023

Statistics, Data Analysis and Probability K8What is 1% of 10% of 100% of $1,000?



ID 5098

Statistics, Data Analysis and Probability K8Gerry tries to play tennis but can only hit the ball 40% of the time.

If 80 balls are hit to Gerry, how many balls can you expect him to hit?



ID 5119

Statistics, Data Analysis and Probability K8In how many ways can Jane put two eggs of different color into the package?