The following data set includes the ages of the last six U.S. presidents at their inauguration. What is the variance for this data set? Round your final answer to one decimal place, if necessary. Age of Last Six U.S. Presidents at Inauguration President Age George H.W. Bush 64 Bill Clinton 46 George W. Bush 54 Barack Obama 47 Donald Trump 70 Joe Biden 78 Provide your answer below: The population variance, $\sigma^2$ , is years