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According to a national study, 37 % of taxpayers used computer software to do their taxes...

According to a national study, 37 % of taxpayers used computer software to do their taxes for a certain tax year. A sample of 125 taxpayers was selected. Complete parts a through d below.

A. Calculate the standard error of the proportion. (Round to four decimal places as needed.)

B. What is the probability that less than 35 % of the taxpayers from the sample used computer software to do their taxes? (Round to four decimal places as needed.)

C. What is the probability that between 31 % and 42 % of the taxpayers from the sample used computer software to do their taxes?

Math   Statistics-And-Probability   
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