2. Use the following data obtained from ages of the last six U. S. Presidents at the time of their inauguration to answer the following questions: Ages of Last 6 Presidents at Inauguration George Bush 64 Bill Clinton 46 George W. Bush 54 Barack Obama 47 70 Donald Trump Joe Biden 78 a. [2 pts] Find the mean of the data set. (Round to one decimal place.) b. C. + Find the standard deviation of the data set. (Do not round until the final answer. Round final answer to 1 decimal place.) Explanation is only an explanation of process, not reasoning for this part. What percentage of presidents' ages fall within one standard deviation of the mean? (Round to 1 decimal place.)

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