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c) What are the mean and standard deviation of the number of incorrect responses? (Give a reason)

c) What are the mean and standard deviation of the number of incorrect responses? (Give a reason)

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Help me with part C

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. a) Knowing that the data is approximately normal, approximately what proportion of respondents had a score between 13 and 25? (DON'T USE MINITAB!) b) Approximately what proportion of respondents had a score lower than 16? Greater than 23? (USE MINITAB/SPSS) c) What are the mean and standard deviation of the number of incorrect responses? (Give a reason)
Transcribed Image Text: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. a) Knowing that the data is approximately normal, approximately what proportion of respondents had a score between 13 and 25? (DON'T USE MINITAB!) b) Approximately what proportion of respondents had a score lower than 16? Greater than 23? (USE MINITAB/SPSS) c) What are the mean and standard deviation of the number of incorrect responses? (Give a reason)
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