Question

The shape of the distribution of the time required to get an oil change at a 20​-minute oil-change facility is unknown.​ However, records indicate that the mean time is 21.6 minutes​, and the standard deviation is 4.6 minutes.

Solve :

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 45 oil changes between 10 A.M. and 12 P.M. Treating this as a random​ sample, there would be a​ 10% chance of the mean​ oil-change time being at or below what​ value? This will be the goal established by the manager.

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

Answer 1