Question 804591
Commuting time is normally distributed with mean 45 mins per day, and standard deviation 10 minutes. What proportion of people spend less than 20 minutes commuting?
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z(20) = (20-45)/10 = -25/10 = -2.5
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p(x < 20 min ) = p(z < -2.5) = normalcdf(-100,-2.5) = 0.0062
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Cheers
Stan H.
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