A random sample of size n = 54 is taken from a population with a mean μ = −10.3 and standard deviation σ = 6. 

a.

Calculate the expected value and the standard error for the sampling distribution of the sample mean. (Negative values should be indicated by a minus sign. Round "expected value" to 1 decimal place and "standard error" to 4 decimal places.)

b.

What is the probability that the sample mean is less than −10? (Round “z” value to 2 decimal places, and final answer to 4 decimal places.)

c.	What is the probability that the sample mean falls between −10 and −9? (Do not round intermediate calculations. Round "z" value to 2 decimal places and final answer to 4 decimal places.)

Answer rating: 100% (QA)

a Expected value 52 10... View the full answer