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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