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Suppose the manager agrees to pay each employee a​ $50 bonus if they meet a certain...

Suppose the manager agrees to pay each employee a​ $50 bonus if they meet a certain goal. On a typical​ Saturday, the​ oil-change facility will perform 40 40 oil changes between 10 A.M. and 12 P.M. Treating this as a random​ sample, at what mean​ oil-change time would there be a​ 10% chance of being at or​ below? This will be the goal established by the manager. mean=11.2 standard deviation=4.9

Math   Statistics-And-Probability   
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Answer #1

From Z-table, Lookup for Z-value corresponding to area 0.10 to the left of the normal curve.


There is a 10% chance of being at or below a mean oil-change time of minutes.

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