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.

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  1. 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?

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  2. 68%

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  3. Jess is right for the first part.

    Z = (score-mean)/SD

    Insert the values and compute.

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

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