Provide an Appropriate Response

question 17

Multiple Choice

Provide an appropriate response.
-Most problems involving normally distributed variables are one of two types. Type A: Find a probability or percentage, e.g. find the probability that X lies in a specified range. Type B: Find the observation corresponding to a given probability or percentage. Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation Of 8. Which of the following questions below are of type B?
A. Find the 80th percentile.
B. Find the cutoff for the A grade if the top 10% get an A.
C. Find the percentage scoring more than 90.
D. Find the score that separates the bottom 30% from the top 70%.
E. Find the probability that a randomly selected student will score more than 80.

• A)a, b, d
• B)b, d
• C)a, b, c, d
• D)c, e

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