An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. He believes that the mean income is$21

$21, and the variance is known to be$37.21

$37.21. How large of a sample would be required in order to estimate the mean per capita income at the85%

85%level of confidence with an error of at most$0.65

$0.65? Round your answer up to the next integer.