Samuel earns $3.25 per hour for babysitting and $8 for each lawn he mows. last month he babysat for 7 hours and mowed 2 lawns. a. how much did he earn babysitting? b. what were his total earnings? a. $56.00; $62.50 c. $11.25; $101.25 b. $22.75; $30.75 d. $22.75; $38.75

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean