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The blood platelet counts of a group of women have a​ bell-shaped distribution with a mean...

The blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 264.3 and a standard deviation of 60.8. (All units are 1000 cells/muμ​L.) Using the Empirical rule, find each approximate percentage below.

a. What is the approximate percentage of women with platelet counts within 3 standard deviations of the mean, or between 81.9 and 446.9?

b. What is the approximate percentage of women with platelet counts between 142.7 and 385.9

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