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AveGali [126]
3 years ago
11

From long experience, it is known that the time it takes to do an oil change and lubrication job on a vehicle has a normal distr

ibution with a mean of 17.8 minutes and a standard deviation of 5.2 minutes. An auto service shop will give a free lube and oil change service to any customer who must wait beyond the guaranteed time to complete the work. If the shop does not want to give more than 1% of its customers a free lube and oil change service, how long should the guarantee be? Round appropriately to the minute.
Mathematics
1 answer:
Delicious77 [7]3 years ago
6 0
7 minutes is the answer i think but dont quote me on that
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Answer:

6    

Step-by-step explanation:

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Step-by-step explanation:

Use Multiplication Principle with states that if a event can occur n ways, and another mutually exclusive event occur p ways, then the total outcome is

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Now, we use the fact that proabliblity is

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A is the answer.

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2 years ago
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just olya [345]

Answer:

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So if we wrote an inequality like:

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Another one (also trivial) can be:

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krok68 [10]

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