For the normal distribution, the mean plus and minus one standard deviation will include about what...

Question

Question

For the normal distribution, the mean plus and minus one standard deviation will include about what percent of the observations?

a. 34% b. 68% c. 48% d. 95%

math Statistics-And-Probability

Answer 1

Answer #1

Let ,

Now ,

; Due to symmetry

; from normal probability table

Therefore , the mean plus and minus one standard deviation will include about 68% percent of the observations.

Answer 2

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