Probability basics Practice Questions (Grade 7)

Question 1easy

A standard die is rolled. What is the probability of not rolling a $6$ ?

Five of the six faces are not $6$ , so $P = 1 - \dfrac{1}{6} = \dfrac{5}{6}$ .

Question 2easy

A bag holds $3$ red marbles and $5$ blue marbles. One marble is drawn at random. What is the probability it is red?

There are $3 + 5 = 8$ marbles in all, and $3$ are red, so $P(\text{red}) = \dfrac{3}{8}$ .

Question 3easy

A spinner has $5$ equal sections: $1$ red, $2$ blue, and $2$ green. What is the probability the spinner does not land on red?

Four of the five equal sections are not red, so $P = \dfrac{4}{5}$ .

Question 4easy

A spinner has $8$ equal sections: $2$ are green and $6$ are yellow. What is the probability the spinner lands on green?

$P(\text{green}) = \dfrac{2}{8} = \dfrac{1}{4}$ .

Question 5easy

Each letter of the word EQUATION is written on a separate card, and one card is drawn at random. What is the probability the letter is not a vowel?

EQUATION has $8$ letters, and $3$ of them ( $Q, T, N$ ) are consonants, so $P = \dfrac{3}{8}$ .

Question 6easy

A standard six-sided die is rolled once. What is the probability of rolling a $4$ ?

Exactly one of the $6$ equally likely faces shows a $4$ , so the probability is $\dfrac{1}{6}$ .

Question 7easy

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

GAMES has $5$ letters, and $2$ of them ( $A$ and $E$ ) are vowels, so $P = \dfrac{2}{5}$ .

Question 8easy

A number cube is rolled once. What is the probability of rolling an even number?

Three of the six faces ( $2, 4, 6$ ) are even, so $P = \dfrac{3}{6} = \dfrac{1}{2}$ .

Probability basics practice