Question #c8a07

1 Answer
Nov 3, 2017

#~~+-0.96#

Explanation:

Because of the symmetrical properties of the Normal distribution, and the information we are given in the question we can draw a diagram as below.

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The Normal probability tables give us the values for

#P( Z <z)#

to find #+z# we need

#P(Z < z)=0.83#

from tables we get

#z~~0.96#

the second value will be #-0.96#