Question

Step 1

__Solution__

**To find: **The area under the shaded region of the given normal curve. i.e., area below *X *= 75.

**Given: **The IQ scores of adults are normally distributed with a mean *µ* = 100 and standard deviation σ = 15.

**Step 1:**

To find the area below *X* = 75, we need to find the *z* score corresponding to *X* = 75.

The *z* score is computed using the formula,

Step 2

**Step 2:**

Substitute the values *X* = 75, *µ* = 100, and σ = 15 in th...

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