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The length of time listeners tune in to a radio station is normally distributed with a...

The length of time listeners tune in to a radio station is normally distributed with a mean of 15.0 minutes and a standard deviation of 3.5 minutes. 80% of listeners are tuned in for less than how many minutes?

A. 20.58

B.15.74

C.20.58

D.17.96

math   Statistics-And-Probability   
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Answer #1

=17.96

Z=0.8416....................by using Z table or by using Excel command =NORMSINV(0.8)

D) 17.96
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