Statistics
Probability
Combination
More probability
Problem Solving
Mathcounts probability
100
Find the mode: 6, 12, 3, 15, 3, 9, 2, 8, 1
What is 3
100
The probability of rolling an odd number on a regular six sided number cube.
What is 1/2
100
A company offers a car in blue, black, and white. The interior can be black, tan, or grey. The amount of possible combinations is...
What is 9
100
Janet has a choice of 7 flowers to plant in her garden. Each flower comes in five colors. How many total choices does she have?
What is 35
100
A pet store has 20 cages for each of its 20 different animals. How many ways might the store be organized?
What is 400
100

Lelah is decorating her bedroom with posters of her four favorite sports teams. She has one poster of each team and wants to put one poster on each of her four walls. In how many ways can Lelah arrange the four posters?

24

200
Find the range: 771, 786, 745, 770, 786, 790, 786
What is 45
200
Simon tossed a coin 30 times. He got heads 12 times. What is the experimental probability of getting heads?
What is 2/5 remember: number of heads = 12 = 2 number of coins tossed = 30 = 5
200
With 8 items on the menu, how many combination pairs can be made?
What is 256 remember: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 or 2^8
200
If the the probability of spinning a four on a spinner is 1/5, the probability of not spinning a four is...
What is 4/5
200
Gerry shops for new school clothes. He spends $35, $38, and $40 on pants; $15, $28, and $20 on shirts; $15 on socks; $68 and $35 on shoes. Find the median amount spent.
What is $35
200

A jar contains 2000 jelly beans. The probability of reaching in and randomly pulling out a red jelly bean is 3/5. The probability of pulling out a blue jelly bean is 1/8. How many jelly beans are neither red nor blue?

550

300
Find the mean: 95, 92, 88, 85, 85, 91, 100, 88, 86, 90, 98, 94
What is 91
300
When rolling a number cube, the theoretical probability of not rolling a 2.
What is 5/6
300
How many ways can I rearrange 3 people?
What is 6
300
A bag has two green marbles, two blue marbles, and one yellow marble. If you were to reach into the bag, what would the probability that you pull out a blue marble be?
What is 2/5
300
Angela wants to know the odds of picking a heart from a deck of cards.
What is 1/4
300

A pair of fair, standard six-sided dice is rolled. What is the probability that the sum of the numbers rolled is 7 or 10? Express your answer as a common fraction

1/4

400
Find the median: 28, 25, 22, 15, 25
What is 25
400
If you toss a coin and roll a number cube, the probability of getting a heads and a 6 is this.
What is 1/12 remember: probability of heads x probability of 6
400
Mark has a pair of boots and a pair of sneakers. He has one pair of white socks, one pair of black socks, and one pair of brown socks. The number of combinations Mark can form are...
What is 6 combinations
400
Alphabet tiles are placed in a bag. Students each pull out one tile at random. What is the probability that a vowel is selected?
What is 5/26
400
The school cafeteria offers three sandwiches, four vegetables, and five juice drinks daily. The number of combinations offered each day is...
What is 60 remember: 3 sandwiches x four vegetables x five drinks
400

A spinner has 5 equal sections labeled 1–5. What’s the chance of landing on a prime number?  

3/5

500
Find the median: $19, $24, $30, $30, $19, $28
What is $26
500
The probability of a certain event.
What is 1
500
Pick a team of three people from a group of ten people. how many combinations are there?
What is 120 remember: C(10,3) 10!/3!
500
Six children entered a drawing to win a bike. John entered three time; Karen entered two times; Roger entered once; Sarah entered twice; Joe entered three times; Linda entered once. The chances a boy was randomly picked was...
What is 7/12
500
A group of students is playing a word game. One letter cube has the letters A, E, I, O, U, and Y. A second cube has the letters B, D, H, S, T, and G. Each player gets to roll the vowel cube once and the consonant cube once to see if he or she can make a word. There are this many possible outcomes.
What is 72
500

A game spinner is divided into five equal sections that earn a player 1, 5, 10, 25, and 50 points. What is the expected number of points Edgar will earn in his first spin of this spinner? Express your answer as a decimal to the nearest tenth.

18.2

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