Please provide step by step explanation. Should be in typewritten. The graph should properly labeled.

3.. A survey was made on the number of customers dining in the restaurant during the first five hours of operation. The results were as follow: Visiting Hour No. of dine-in customers 1* hour 12 2d hour 25 3 hour 47 4* hour 58 5 hour 64 Construct a graph corresponding to this distribution and determine whether the distribution is normal or not. If not, is it positively or negatively skewed? 4. An engineer tested nine samples of each of three designs of a certain bearing for a new electrical winch. The following data are the number of hours it took for each bearing to fail when the winch motor was run continuously at maximum output, with a load on the winch equivalent to 1.9 times the intended capacity. DESIGN A B C 16 18 21 16 27 17 53 34 23 21 34 23 17 32 21 25 19 18 30 34 21 21 17 28 45 43 19 a. Calculate the mean and the median for each group. b. Which design is best and why