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

0.4

Answer

0.5

Answer

0.7

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

Mean

Answer

Mode

Answer

Range

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

4/25

Answer

1/6

Answer

2/5

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

$0.75M

Answer

$1.5M

Answer

$3M

Question 5

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

Accepted Answer

1/2

Answer

1/3

Answer

2/3

Answer

1/6

Question 6

A histogram shows test scores: 50–60 (5 students), 60–70 (12 students), 70–80 (18 students), 80–90 (10 students). What percent scored in the 70–80 range?

Accepted Answer

36%

Answer

40%

Answer

44%

Answer

38%

Question 7

If events A and B are independent, P(A) = 0.5, and P(B) = 0.4, what is P(A and B)?

Accepted Answer

0.2

Answer

0.9

Answer

0.1

Answer

0.45