Finding probability value using normal approximation for the given data.
Find out the specified probability, from a table of Normal probabilities. A restaurant's receipts show that the cost of customers' dinners has a skewed distribution with a mean of $54 and a standard deviation of $18. What is the probability that the next 100 customers would spend an average of less than $56 on dinner?
a.0.1552
b.0.4558
c.0.1335
d.0.5442
e.0.8665