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6 February, 05:46

A sample data set with a mean of 685 and a standard deviation of 39.8 has a bell-shaped distribution. what range of values include approximately 68% of the data?

a. between 645.2 and 724.8

b. between 605.4 and 764.6

c. between 565.6 and 804.4

d. between 656.2 and 703.8

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  1. 6 February, 06:04
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    The correct choice is A) between 645.2 and 724.8.

    According to the empirical rule, 68% of data will fall within 1 standard deviation from the mean. This means it will be either 39.8 lower than the mean or 39.8 higher than the mean:

    685-39.8 = 645.2

    685+39.8 = 724.8
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