One-event probability word problems Practice Questions

One-event probability word problems. Game on.

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

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Warm-upeasy

A jar contains $5$ red tokens and $7$ blue tokens. One token is chosen at random. What is the probability that the token is red?

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

Mid-gameeasy

A game spinner is divided into $12$ equal sections. Exactly $4$ sections are gold and the rest are silver. What is the probability that the spinner lands on gold on one spin?

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

Mid-gameeasy

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

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

Mid-gameeasy

A bowl contains $4$ lemons and $9$ limes. One piece of fruit is chosen at random. What is the probability that the fruit is a lime?

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

Mid-gameeasy

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

The odd faces are $1$ , $3$ , and $5$ , so $P(\text{odd}) = \dfrac{3}{6} = \dfrac{1}{2}$ .

Mid-gamemedium

A club has $24$ members. Of these members, $9$ play soccer. If one member is selected at random, what is the probability that the member plays soccer?

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

Mid-gamemedium

A school raffle has $50$ identical tickets sold. Maya buys $5$ of the tickets. One winning ticket is drawn at random. What is the probability that Maya wins?

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

Buzzer beatermedium

A whole number from $1$ through $25$ is chosen at random. What is the probability that the number is a multiple of $4$ ?

The multiples of $4$ from $1$ to $25$ are $4, 8, 12, 16, 20,$ and $24$ , so $P = \dfrac{6}{25}$ .

One-event probability word problems. Game on.

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