A local store knows that the mean purchase per customer is $57.84. Suppose the purchases per...
A local store knows that the mean purchase per customer is $57.84. Suppose the purchases per customer are normally distributed with a standard deviation of $4.63. What is the probability that in a sample of 26 customers the mean purchase per customer is between $56 and $58?
a) 0.1774
b) 0.5502
c) 0.0212
d) 0.5714
Homework Answers
Consider,
X=purchase per customer
=P[-2.03<Z<0.18]
=0.5714-0.0212...............................by using normal probability table.
=0.5502
Option b) is correct.
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