Page 1 of 1 The time required for an automotive center to complete an oil change
ID: 2909384 • Letter: P
Question
Page 1 of 1 The time required for an automotive center to complete an oil change service on an (a) The automotive center guarantees customers that the service will take no longer than 20 (b) If the automotive automobile approximately folows a normal distribution, with a mean of 1 minutes. It it does take longer, the customer will receive the sen center does not want to give the discount to more than 3% of its customers, how long should it make the guaranteed time imm? Click here to view the standard normal distribution table (page 1 (a) The percent of customers that receive the service for half-price is [N. Round to two decimal places as needed) (b) The guaranteed time limit is minutes (Round up to the nearest minute.) Enter your answer in each of the answer boxes llaver Plaver.aspx?cultureld &Explanation / Answer
a) P(X>20)
= P(Z>(20-19)/2.5)
= P(z>0.4)
Use Excel function
1-NORMSDIST(A1)
= 34.46%
b) Guaranteed Price
=NORMSINV(0.97)*2.5+19
= 24
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