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Question: A survey/quiz is given to 100 people. The survey has 30 questions. The mean number of correct responses is 21, with a standard deviation

Question:

A survey/quiz is given to 100 people. The survey has 30 questions. The mean number of correct responses is 21, with a standard deviation of 4. The data is approximately normal.

What are the mean and standard deviation of the number of incorrect responses?

Answer is

mean = 9

SD = 4

I need explanation

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