Asked by Joe

In a study of
800 men,diastolic blood pressure was found to be approximately normally distributed, with a mean of 84 millimeters (mm) of mercury and standard deviation of 10 millimeters.

Use the 68-95-99.7% rule to determine what percentage of the test group had a diastolic pressure between 74 millimeters
and 94 millimeters of mercury.
Answered by Joe
It is found that the number of raisins in a box of a popular cereal is normally distributed, with a mean of 133 raisins per box and a standard deviation of 10 raisins. My cereal box has 147 raisins. What is the z-score for this box of cereal?
Answered by Jess
68%
Answered by PsyDAG
Jess is right for the first part.

Z = (score-mean)/SD

Insert the values and compute.
Answered by April
Box of cereal--
You have a mean of 133 raisins with a standard deviation of 10. The cereal box has 147 raisins.
147-133=14
14/10 (Enter fourteen divided by 10 in the calculator)=1.4
The Z score is 1.4.
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