Question

Asked Apr 12, 2019

Step 1

**The z-score:**

The *z*-score of a normally distributed random variable, *X*, with mean *μ* and standard deviation *σ*, at the point *x*, is given as:

Step 2

**Calculation:**

The normally distributed IQ score, *X* has mean *μ* = 100 and standard deviation *σ* = 15.

According to the given graph, the probability of *X*, above the value *x*, is 0.6; that is, *P* (*X* > *x*) = 0.6....

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