Question: 2.19 A set of data is mounded, with a mean of 300 and a variance of 144. Approximately what proportion of the observations is a.

2.19 A set of data is mounded, with a mean of 300 and a variance of 144. Approximately what proportion of the observations is

a. greater than 288?

b. less than 324?

c. greater than 336?

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