The time to complete an exam is approximately Normal with a mean μ\displaystyle \mu = 40 minutes and a standard deviation σ\displaystyle \sigma = 4 minutes.

The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation.



1. Fill in the indicated boxes.

μ=40\displaystyle \mu={40}
σ=4\displaystyle \sigma={4}

2. Used the Empirical Rule to complete the following statements:
    68% of testing times were between minutes and minutes.
    % of the testing times were between 32 minutes and 48 minutes.