Solution
Given that,
P( -c< Z < c) = 0.9512
P( Z < c) - P( Z < -c) = 0.9512
2*P(Z < c) - 1 = 0.9512
2*P(Z < c) = 1 + 0.9512
P( Z < c) = 1.9512 / 2
P( Z < c) = 0.9756
P( Z < 1.97 ) = 0.9756
c= 1.97
and
-c = -1.97
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