Assume that adults have IQ scores that are normally distributed with a mean of 1

Monincbh

Monincbh

Answered question

2021-11-10

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. (Hint: Draw a graph in each case.) Find the probability that a randomly selected adult has an IQ between 90 and 110 (referred to as the normal range).

Answer & Explanation

Provere

Provere

Beginner2021-11-11Added 18 answers

Step 1
The standardized value is the value decreased by the mean, divided by the standard deviation:
z=xμσ=90100150.67
z=xμσ=110100150.67
Determine the corresponding probability using table A-2:
P(0.67<Z<0.67)=P(Z<0.67)P(Z<0.67)=0.74860.2514=0.4972
Result
0.4972

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