Probability & Stats - Normal Distribution

Statistics
Tutor: None Selected Time limit: 1 Day

1.The lengths in minutes of feature films for the current year follow a normal distribution with a mean of 109 minutes and standard deviation of 12 minutes. What percentage of feature films in the current year last longer than two hours (120 minutes)

Mar 2nd, 2015

z = (120-109)/12 = 11/12 = 0.92

P ( Z > 0.92) = 0.1788

17.88% or 18% 


Mar 2nd, 2015

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Mar 2nd, 2015

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