3a) If the standard error of the sample mean isSE() = 52.1 and the sample size is n = 110, what is the sample standard deviation s? (Round your intermediate numbers to4 decimal places. Round youfinal answerto3 decimal places.)

b) Hoping to lure more shoppers downtown, a city builds a new public parking garage in the central business district. The city plans to pay for the structure through parking fees. For a random sample of 46 weekdays, daily fees collected averaged $10100, with standard deviation of $1200. Find a 90% confidence interval for the mean daily income this parking garage will generate and report the lower limit.