When Zahra runs the 400 meter dash, her finishing times are normally distributed with a mean of 84 seconds and a standard

Question

When Zahra runs the 400 meter dash, her finishing times are normally distributed
with a mean of 84 seconds and a standard deviation of 1.5 seconds. Using the
empirical rule, what percentage of races will her finishing time be between 81 and 87
seconds?

Kunduz · Accepted Answer

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