Question

# The mean of a normal probability distribution is 400; the standard deviation is 15. a. About...

The mean of a normal probability distribution is 400; the standard deviation is 15. a. About 68% of the observations lie between what two values? Lower Value Upper Value b. About 95% of the observations lie between what two values? Lower Value Upper Value c. Nearly all of the observations lie between what two values? Lower Value Upper Value

statisyics

According to the empirical rule, approximately 68%, 95% and 99.73% observations lie within one, two and three standard deviations from the mean respectively.

a)

So, about 68% observation lie in the interval:

b)

So, about 95% observation lie in the interval:

c)

So, about 99.73% i.e. nearly all observation lie in the interval:

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