Calculate an approximate 99.7 % confidence interval for the population mean race times based on the following sample data: From a sample of 81 runners, the sample mean race time is 157 seconds. Assume the distribution of times is normally distributed and the population standard deviation is 7.5 seconds. Enter your answer in the format (lower,upper) where "lower" is the lower confidence limit and "upper" is the upper confidence limit. Round each numerical input to one decimal place.Write "six and forty-two ten-thousandths" as a decimal