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In a study of recent single artist concerts, it was found that the artist spent an...

In a study of recent single artist concerts, it was found that the artist spent an average of 95 minutes on stage.If the ties spent on stage by artist are normally distributed with a standard of 23 minutes, find the following probabilities

a. the artist is on stage form more than 120minutes

b. the artist is on stage for at most 90minutes

c. some artist do not spend much time on stage, find the cut-off value from the amount of time spent on stage by those artist in the lower 15th percentile.

Math   Statistics-And-Probability   
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Answer #1

It is given that the ties spent on stage by artist are normally distributed with a standard of 23 minutes and  an average of 95 minutes on stage. So

a) The probability,

b) The probability,

c) The lower 15th percentile is

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