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7. A class of 58 students takes a true-false quiz consisting of 20 questions. Each answer...

7. A class of 58 students takes a true-false quiz consisting of 20 questions. Each answer will get

a score of 1 if it is correct and -1 otherwise; no other score is possible.

The GSIs keep track of the number of answers each student gets correct. The average of these

58 numbers is 16.1 and the SD is 2.3.

In each of the following parts, find the quantity if it is possible to do so with the information

given. If it is not possible, explain why not.

a) the average number of answers that were anything other than correct

b) the SD of the number of answers that were anything other than correct

c) the average score on the test

d) the SD of scores on the test

Math   Statistics-And-Probability   
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