Question

# For the follow questions please record your answers to at least three decimal places.

The scores of

students on the SAT college entrance examinations at a certain high school had a normal distribution with mean μ=554.9 and standard deviation σ=28.6

(a) What is the probability that a single student randomly chosen from all those taking the test scores 560 or higher?

ANSWER:

For parts (b) through (d), consider a simple random sample (SRS) of 25 students who took the test.

(b) What are the mean and standard deviation of the sample mean score x dash of 25 students?

The mean of the sampling distribution for x dash is :

The standard deviation of the sampling distribution for x dash is :

(c) What z-score corresponds to the mean score x dash of 560?

ANSWER:

(d) What is the probability that the mean score x dash of these students is 560 or higher?

ANSWER:

#### Top Answer

(a) What is the probability that a single student randomly chosen from all those taking the test scores 560 or higher?... View the full answer