googoo4
31.12.2019 •
Mathematics
Suppose that the waiting time for a pizza to be ready at a local pizzeria has been found to be normally distributed with a mean of 15 minutes and a standard deviation of 7 minutes. suppose that in an effort to provide better service to the customers, the manager has decided to provide discounts to those individuals whose waiting time exceeds a predetermined time. the manager decides that 15% of the customers should receive this discount. what are the number of minutes they need to wait to receive the discount?
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Ответ:
If the waiting time exceeds 22.52 minutes, the customer will receive the discount.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 15 minutes
Standard Deviation, σ = 7 minutes
We are given that the distribution of waiting time is a bell shaped distribution that is a normal distribution.
Formula:
We have to find the value of x such that the probability is 0.15
P(X > x) = 0.15
Calculating the value from standard normal table, we have,
Comparing, we get,
If the waiting time exceeds 22.52 minutes, the customer will receive the discount.
Ответ:
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Step-by-step explanation: