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Please find the proportions in the following questions. 1. What proportion of a normal distribution is located between the z= -0.25 and z= +0.25? 2.

Please find the proportions in the following questions.

1. What proportion of a normal distribution is located between the z=-0.25 and z=+0.25?

2. IQ test scores are standardized to produce a normal distribution with a mean of =100 and =15. Find the proportion of the population in each of the following IQ categories.

1. Genius or near genius: IQ greater than 140

2. Very superior intelligence: IQ between 120 and 140

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