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E 7-9 Connect HW Saved 1 The mean of a normal probability distribution is 380, the standard deviation is 16. a. About 68% of
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Answer #1

1. 68% value will lie within

So u-sigma and u+sigma that is 380-16 and 380+16

So 364 and 396 by empirical rule

2.95% will lie within

U-2sigma and u+2sigma that is 380-32 and 380+32

So 348 and 412

3. Practically all value lie within u-3sigma and u+3 Sigma

380-48 and 380+48

So 332 and 428

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