George is taking part in a charity swim. He received $345 in fixed pledges, and he receives $30 more in pledges for each lap he swims. Write an equation for the amount of money P George will learn in terms of the distance d he swims, measured in miles. I NEED IT NOW PLEASEEE

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t. inv.2t to find the value of t for the interval calculation.