Question: Suppose that a random variable X is normally distributed with mean 91 and standard deviation 21. If a random sample of size 36 is taken,

Suppose that a random variable X is normally distributed with mean 91 and standard deviation 21. If a random sample of size 36 is taken, which of the following is the z value whenXis 136?

a, 12.86

b, -12.86

c, 2.14

d, -2.14

e, 0.23

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