Question

Entered Answer Preview Result -3.83 -3.83 incorrect The answer above is NOT correct (1 point) College students average 7.4 hours of sleep per night with a standard deviation of 40 minutes If the amount of sleep is normally distributed, what proportion of college students sleep for more than 8.5 hours? Proportion -3.83

Answer 1

for normal distribution z score =(X-μ)/σ
here mean=       μ=	7.4
std deviation   =σ=	0.6667

probability =

P(X>8.5)

=

P(Z>1.65)=

1-P(Z<1.65)=

1-0.9505=

0.0495