Foxbees magazine published data on the best small firms in 2012. These publicly traded firms have a stock price of at least $5 per share and have reported annual revenue between $5 million and $1 billion. The data below shows the ages of the corporate CEOs for a random sample of these firms. 39 46 45 61 37 71 53 53 64 47 36 39 62 66 52 54 47 62 57 71 66 49 50 36 69 69 14 35 40 47 72 52 37 68 68 64 69 67 43 67 74 75 67 35 66 68 72 60 38 62 R vector Copy to clipboard a) What is the mean of the sample? | 55.82 Round to 4 decimal places) b) What is the standard deviation of the sample mean or the standard error? Round to 4 decimal places) c) What is the sample size? 50 (Round to whole number) d) What is the t critical value for a 83% confidence interval? 1.3926 [Round to 4 decimal places). e) What is the error bound or margin of error? (Round to 4 decimal places) f) What are the Lower and Upper limits for a 83% confidence interval? [ (Round to 4 decimal places)