Find the z-score for an IQ test score of 142 when the mean is 100 and the standard deviation is 15.

A. 42

B. 2.8

C. 18.78

D. 1.27

E. -2.8

According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 68.26% of all workers will fall?

A. [394.8 431.2]

B. [386.2 439.8]

C. [372.8 453.2]

D. [359.4 466.6]

E. [332.6 493.4]

According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 95.44% of all workers will fall?

A. [387.5 438.5]

B. [386.2 439.8]

C. [372.8 453.2]

D. [359.4 466.6]

E. [332.6 493.4]

According to a survey of the top 10 employers in a major city in the Midwest, a worker spends an average of 413 minutes a day on the job. Suppose the standard deviation is 26.8 minutes and the time spent is approximately a normal distribution. What are the times that approximately 99.73% of all workers will fall?

A. [305.8 520.2]

B. [386.2 439.8]

C. [372.8 453.2]

D. [359.4 466.6]

E. [332.6 493.4]

In a statistic class, 10 scores were randomly selected with the following results were

obtained: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66

What is the 90th percentile?

A. 77

B. 73

C. 74

D. 67

E. 65.9

In a statistic class, 10 scores were randomly selected with the following results were

obtained: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66

What is the third quartile?

A. 65.9

B. 67.3

C. 66.75

D. 73.85

E. 77.0

In a statistic class, 10 scores were randomly selected with the following results were

obtained: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66

What is the first quartile?

A. 65.9

B. 67.3

C. 66.75

D. 73.85

E. 77.0

In a statistic class, 10 scores were randomly selected with the following results were

obtained: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66

What is the 10th percentile?

A. 65.9

B. 67.3

C. 66.75

D. 73.85

E. 77.0

In a statistic class, 10 scores were randomly selected with the following results were

obtained: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66

What is the 65th percentile?

A. 65.9

B. 67.3

C. 66.75

D. 73.85

E. 77.0

According to Chebyshev's theorem, how many standard deviations from the range would

include at least 80% of the values?

A. 5.0

B. 2.2

C. 2.5

D. 1.6

E. 2.0