Fred decided to study the number of exemptions claimed on personal tax returns he prepared in 2017.
Question:
Fred decided to study the number of exemptions claimed on personal tax returns he prepared in 2017. The data are summarized in the following table.
Exemptions ............................Percent
1................................................ 20
2.................................................. 50
3.................................................. 20
4.................................................. 10
a. What is the mean number of exemptions per return?
b. What is the variance of the number of exemptions per return?
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Related Book For 
Statistical Techniques in Business and Economics
ISBN: 978-1259666360
17th edition
Authors: Douglas A. Lind, William G Marchal
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