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Use the following frequency distribution (of SAMPLE DATA)in answering the questions: class 0-10 f=10; class 10-20 f=20; class 20-30 f=40; class 30-40 f=20; class 40-50 f=10.

QUESTION 1- What is the midpoint of the 3rd class?

QUESTION 2- What is the total number of observations in the frequency distributuion?

QUESTION 3- What is the relative frequency of the 3rd class?

QUESTION 4- In the formula for the standard deviation in this problem do you use "N' or "n-1"?

QUESTION 5- What is the value of the mean?

QUESTION 6- What is the value of the standard deviation?

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