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would this be greater than 90% or greater than 10% of the times? It is really...

would this be greater than 90% or greater than 10% of the times? It is really cocnfusing plz explaijn. I will rate.

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Answer #1

The management has decided tp offer incentive to any installer with an installation time that is faster than 90% of the times, that means for greater than 90%

The value of Z for 90% is 1.282

The time that is faster than 90% of the times is

X = \mu +Z\sigma = 32+1.282*1.5 = 33.923 hours

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