A company that owns a large number of grocery stores claims that customers who pay by...
A company that owns a large number of grocery stores claims that customers who pay by personal check spend an average of $87 with a standard deviation of $22. Assume the amount spent by these customers is normally distributed.
What is the probability that a customer using a check spends less than $90?
Express your answer as a decimal rounded to four places after the decimal point.
Homework Answers
Solution :
P(x < 90) = P[(x - 
) / 
< (90 - 87) / 22]
= P(z < 0.14) [Using standard normal table]
= 0.5557
Probability = 0.5557
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