The blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 255.3 and a standard deviation of 67.4. ​(All units are 1000 ​cells/ μ​L.) Using the empirical​ rule, find each approximate percentage below. a. What is the approximate percentage of women with platelet counts within 2 standard deviations of the​ mean, or between 120.5 and 390.1​? b. What is the approximate percentage of women with platelet counts between 187.9 and 322.7?

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