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Nostrana [21]
4 years ago
6

The 20 to 34 age groups are approximately normally distributed with µ = 110

Mathematics
1 answer:
Savatey [412]4 years ago
7 0

Answer:

21.94% of people aged 20 to 34 have IQs between 125 and 150.

Step-by-step explanation:

<u>The complete question is:</u> Scores on the Wechsler Adult Intelligence Scale (a standard IQ test) for the 20 to 34 age group are approximately Normally distributed with  μ = 110  and  σ = 25.

What percent of people aged 20 to 34 have IQs between 125 and 150?

Let X = <u><em>Scores on the standard IQ test for the 20 to 34 age group</em></u>

SO, X ~ Normal(\mu=110,\sigma^{2} =25^{2})

The z-score probability distribution for the normal distribution is given by;

                            Z  =  \frac{X-\mu}{\sigma}  ~ N(0,1)

where, \mu = population mean = 110

            \sigma = standard deviation = 25

Now, the percent of people aged 20 to 34 have IQs between 125 and 150 is given by = P(125 < X < 150) = P(X < 150) - P(X \leq 125)

       P(X < 150) = P( \frac{X-\mu}{\sigma} < \frac{150-110}{25} ) = P(Z < 1.60) = 0.9452

       P(X \leq 125) = P( \frac{X-\mu}{\sigma} \leq \frac{125-110}{25} ) = P(Z \leq 0.60) = 0.7258

The above probability is calculated by looking at the value of x = 1.60 and x = 0.60 which has an area of 0.9452 and 0.7258.

Therefore, P(125 < X < 150) = 0.9452 - 0.7258 = 0.2194 or 21.94%

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