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Find the cut-off value for the amount of time spent

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In a study of recent single artist concerts, it was found that the artist spent an average of 95 minutes on stage. If the times spent on stage by artists are normally distributed with a standard deviation of 23 minutes, find the following probabilities: a. the artist is on stage for more than 120 minutes. b. the artist is on stage for at most 90 minutes. c. Some artists do not spend much time on stage; find the cut-off value for the amount of time spent on stage by those artists in the lower 15th percentile.

Reference no: EM132384275

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