Question

Suppose a simple random sample of size

nequals=6464

is obtained from a population with

mu equals 80μ=80

and

sigma equals 32σ=32.

​(a) Describe the sampling distribution of

x overbarx.

​(b) What is

Upper P left parenthesis x overbar greater than 85.6 right parenthesisP x>85.6​?

​(c) What is

Upper P left parenthesis x overbar less than or equals 71.6 right parenthesisP x≤71.6​?

​(d) What is

Upper P left parenthesis 76.4 less than x overbar less than 90 right parenthesisP 76.4<x<90​?

Answer 1