1. The average weight of 6 people in an elevator is 173 pounds. A 7^th person gets on and now the average weight is 165 pounds. How much did the 7^th person weigh?

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
Donald Trump	70
Joe Biden	78

1. [1.5 pts] Find the mean of the data set. (Round to one decimal place.)

b. [4 pts] Find the standard deviation of the data set. (Do not round until the final answer. Round final answer to 1 decimal place.)

c. [1 pt] What percentage of presidents' ages fall within one standard deviation of the mean? (Round to 1 decimal place.)

d.[0.5 pt] What percentage of the last six U.S. Presidents were inaugurated while in their 50's? (Round to 1 decimal place.)

e. [0.5 pt]What percentage of the last six U.S. Presidents were inaugurated before the age of 50? (Round to 1 decimal place.)