Question: 1. (4 points) IQ Tests. The distribution of scores of 1000 students who take a standardized…

1. (4 points) IQ Tests. The distribution of scores of 1000 students who take a standardized intelligence test is a normal distribution. The mean is 450 and the standard deviation is 25.

Answer the following questions using the 68-95-99.7 properties of the normal distribution.

a. How many scores fall between 425 and 475?

b. How many scores fall above 500?

c. How many scores fall between 400 and 425?

d. How many scores fall below 525?

Solution

The problem refers to a normal distribution of IQ scores for 1000 students with a