SOLUTION: a research concludes that the number of hours of exercise per week for adults is normally distributed with a mean of 3.5 hours and a standard deviation of 3 hours a- find the 75

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Question 1062005: a research concludes that the number of hours of exercise per week for adults is normally distributed with a mean of 3.5 hours and a standard deviation of 3 hours
a- find the 75th percentile for the distribution of exercise time per week
b- what is the probability that a randomly selected adult has more than 5 hours of exercise per week
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Using NORMSINV in EXCEL to find z so that P%28z%29=0.75.
z=0.67449
So,
%28X-3.5%29%2F3=0.67449
X=5.52hrs
.
.
.
Find the z score,
z=%285-3.5%29%2F3=0.5
So then,
P%280.5%29=0.691462