A simple random sample of size
nequals=8181
is obtained from a population with
mu equals 73?=73
and
sigma equals 18?=18.
?(a) Describe the sampling distribution of
x overbarx.
?(b) What is
Upper P left parenthesis x overbar greater than 75.9 rightparenthesisP x>75.9??
?(c) What is
Upper P left parenthesis x overbar less than or equals 68.8right parenthesisP x?68.8??
?(d) What is
Upper P left parenthesis 71 less than x overbar less than 77.8right parenthesisP 71
