CLAST Statistics and Probability 4

Question 1

A survey of 200 students found 120 prefer math. Based on this sample, what is the estimated probability that a randomly selected student prefers math?

Accepted Answer

0.6

Answer

Experimental probability = 120/200 = 0.6.

Question 2

The data set 10, 15, 15, 20, 25, 100 has a mean of 30.8. Which measure best represents the center of this data?

Accepted Answer

Median

Answer

The outlier 100 inflates the mean, so the median (17.5) better represents the typical value.

Question 3

A jar contains 4 red and 6 white balls. Two balls are drawn without replacement. What is the probability both are red?

Accepted Answer

2/15

Answer

P(both red) = (4/10) × (3/9) = 12/90 = 2/15.

Question 4

A line graph shows a company's revenue increasing from $2M in 2020 to $5M in 2023. What is the average annual increase?

Accepted Answer

$1M

Answer

Total increase = $3M over 3 years, so average annual increase = $3M/3 = $1M per year.

Question 5

A die is rolled once. What is the probability of rolling a prime number?

Accepted Answer

1/2

Answer

Prime numbers on a die are 2, 3, and 5 — that is 3 out of 6 faces, so P = 3/6 = 1/2.

CLAST - College Level Academic Skills Test Practice Test

CLAST - College Level Academic Skills Test Practice Test

CLAST Statistics and Probability 4