H learn.humber.ca Data Management In Soclety .. RSMT-WOOaRBT FINAL EXAM Final Exam A research firm condUCted a survey to determine the mean repair costion refrigerators. They found that the distribution of repair costs followed the normal distribution with a population standard deviation of $111.04. A random sample of 50 refrigerators had a mean repair cost of $56.00. Round your answer in part (a) to 2 decimal places. (a) Whatis the critical ziva'lueitjhat will need to be used to calculate the 95% x centidence interval? :7 ' ; , 1 " Round your answers in part (b) to 2 decimal places. (bi What is the? 95% 'Cbhd'ice Mamet? 7 Round your answer in hart to) to 2 decimal places. - [Gil Wht is the critical devalue that will need to be used to calculate the 98% Condence interval? = ,. Round your answers in part (d) to two decimal places. (d) What is the 98% confidence interval