Grade 7 · Statistics & probability

One-event probability word problems practice

One-event probability word problems is a grade 7 math skill aligned to Common Core standard 7.SP.C.7: develop a probability model and use it to find probabilities of events. Below are 8 practice questions with answers and step-by-step explanations, drawn from the 10 one-event probability word problems problems our math games drill.

CCSS 7.SP.C.710 questions in the bank
Sample questions

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Question 1easy

A jar contains 55 red tokens and 77 blue tokens. One token is chosen at random. What is the probability that the token is red?

There are 5+7=125 + 7 = 12 tokens in all and 55 are red, so P(red)=512P(\text{red}) = \dfrac{5}{12}.

Question 2easy

A game spinner is divided into 1212 equal sections. Exactly 44 sections are gold and the rest are silver. What is the probability that the spinner lands on gold on one spin?

P(gold)=412=13P(\text{gold}) = \dfrac{4}{12} = \dfrac{1}{3}.

Question 3easy

One letter is chosen at random from the word STUDENT. What is the probability that the letter is a vowel?

STUDENT has 77 letters. The vowels are U and E, so P(vowel)=27P(\text{vowel}) = \dfrac{2}{7}.

Question 4easy

A bowl contains 44 lemons and 99 limes. One piece of fruit is chosen at random. What is the probability that the fruit is a lime?

There are 4+9=134 + 9 = 13 pieces of fruit and 99 are limes, so P(lime)=913P(\text{lime}) = \dfrac{9}{13}.

Question 5easy

A standard six-sided number cube is rolled once. What is the probability of rolling an odd number?

The odd faces are 11, 33, and 55, so P(odd)=36=12P(\text{odd}) = \dfrac{3}{6} = \dfrac{1}{2}.

Question 6medium

A club has 2424 members. Of these members, 99 play soccer. If one member is selected at random, what is the probability that the member plays soccer?

P(soccer)=924=38P(\text{soccer}) = \dfrac{9}{24} = \dfrac{3}{8}.

Question 7medium

A school raffle has 5050 identical tickets sold. Maya buys 55 of the tickets. One winning ticket is drawn at random. What is the probability that Maya wins?

Maya holds 55 of the 5050 tickets, so P(Maya wins)=550=110P(\text{Maya wins}) = \dfrac{5}{50} = \dfrac{1}{10}.

Question 8medium

A whole number from 11 through 2525 is chosen at random. What is the probability that the number is a multiple of 44?

The multiples of 44 from 11 to 2525 are 4,8,12,16,20,4, 8, 12, 16, 20, and 2424, so P=625P = \dfrac{6}{25}.

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Math games for Grade 7

Questions like these are served inside our head-to-head math games.

Blaster Gate gameBlaster GateBlast through the wall. First to clear wins.Blitz Tanks gameBlitz TanksSolve math to load shells. Out-think the battalion. Last math standing wins.
Tests that cover one-event probability word problems:
NAEPPSAT 8/9SBACSC READYNC EOG/EOC
More Grade 7 skills:
Circle formulasPercent proportion word problemsSolving one- and two-step linear equationsAngle relationshipsCombining like terms and distributingCompound probabilityInteger operationsPercent problemsAll Grade 7 practice →

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