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QUESTION 20 An analyst in a personnel department randomly selects the records of 48 hourly employees and nds that the mean wage rate per hour is 42 with a standard deviation of 9. Find the lower condence limit of the 90% condence interval estimate for the mean wage of all hourly employees. Round your answer to two decimal places. QUESTION 21 Salaries of computer engineers in UAE are strongly right skewed with mean 32,000 Dhs and standard deviation 4,500 Dhs. A random sample of 9 computer engineers is taken. What is the probability that the average salary of the sample is less than 33,000 Dhs? 0 Not enough information 0 0.7475 0 0.2266 0 0.5879 QUESTION 22 The following data give the amount of time (in minutes) in one day spent on Facebook by each of 10 college students. 78 87 83 100 84 47 79 80 91 I 71 Assume that the underlying distribution of the times is normal. Find the upper condence limit of the 95% condence interval for the mean amount of time (in minutes) in one day spent on Facebook by college students. Round your answer to the nearest minute (Whole number)