7.SP.A.2 Math Practice Questions — Sports Academy Games

Practice playeasy

In a random sample of 40, 12 were red marbles. Estimate how many of 200 are red in the whole population.

Proportion $= \dfrac{12}{40}$ . Estimate $= \dfrac{12}{40} \times 200 = 60$ .

Practice playeasy

In a random sample of 30, 9 were left-handed students. Estimate how many of 300 are left-handed in the whole population.

Proportion $= \dfrac{9}{30}$ . Estimate $= \dfrac{9}{30} \times 300 = 90$ .

Practice playeasy

In a random sample of 50, 15 were defective bulbs. Estimate how many of 400 are defective in the whole population.

Proportion $= \dfrac{15}{50}$ . Estimate $= \dfrac{15}{50} \times 400 = 120$ .

Practice playeasy

In a random sample of 20, 7 were voters favoring the plan. Estimate how many of 100 are favoring in the whole population.

Proportion $= \dfrac{7}{20}$ . Estimate $= \dfrac{7}{20} \times 100 = 35$ .

Practice playeasy

A random sample of 12 contained 3 successes. What is the sample proportion (as a simplified fraction)?

Proportion $= \dfrac{3}{12} = \dfrac{1}{4}$ .

Practice playeasy

A random sample of 20 contained 5 successes. What is the sample proportion (as a simplified fraction)?

Proportion $= \dfrac{5}{20} = \dfrac{1}{4}$ .

Practice playeasy

A random sample of 32 contained 8 successes. What is the sample proportion (as a simplified fraction)?

Proportion $= \dfrac{8}{32} = \dfrac{1}{4}$ .

Practice playeasy

In a random sample, 12 of 48 shoppers chose vanilla. What percent of all shoppers would you expect to choose vanilla?

$\dfrac{12}{48} = \dfrac{1}{4} = 25\%$ .

7.SP.A.2 math practice. Learn by doing.