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photoshop1234 [79]
2 years ago
5

Assume that adults have IQ scores that are normally distributed with a mean of 95.695.6 and a standard deviation of 19.519.5. Fi

nd the probability that a randomly selected adult has an IQ greater than 115.9115.9
Mathematics
1 answer:
nikitadnepr [17]2 years ago
3 0

Answer:

0.14917

Step-by-step explanation:

We have been given that adults have IQ scores that are normally distributed with a mean of 95.6 and a standard deviation of 19.5. We are asked to find the probability that a randomly selected adult has an IQ greater than 115.9.

First of all, we will find z-score corresponding to 115.9 using z-score formula.

z=\frac{x-\mu}{\sigma}, where

z = z-score,

x = Random sample score,

\mu = Mean,

\sigma = Standard deviation.

Upon substituting our given values in z-score formula, we will get:

z=\frac{115.9-95.6}{19.5}

z=\frac{20.3}{19.5}

z=1.04

Now, we will use normal distribution table to find the P(z>1.04).

Using formula P(z>a)=1-P(z, we will get:

P(z>1.04)=1-P(z

P(z>1.04)=1-0.85083

P(z>1.04)=0.14917

Therefore, the probability that a randomly selected adult has an IQ greater than 115.9 is 0.14917 or approximately 14.92%.

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