Answer:
4.4% of the population with IQ between 120 and 125.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 100
Standard Deviation, σ = 15
We are given that the distribution of IQ scores is a bell shaped distribution that is a normal distribution.
a) Let X be a person's IQ score.
Then, density functions for IQ scores is given by:

b) P(population with IQ between 120 and 125.)
Formula:



<u>Answer:</u>
<u>Step-by-step explanation:</u>
<u>Write the product:</u>
<u>Convert it to improper fraction:</u>
<u>Multiply:</u>
<u>Simplify:</u>
Hence, <u>the product is 21/32.</u>
Hoped this helped.

Answer:
6x
Step-by-step explanation:
Step 1: Write equation
x + 2x + 3x
Step 2: Combine like terms
3x + 3x
6x
The answer is )A
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