Thank you in advance

3) Sketch a histogram for the following set of data. The data set: age (in years) of 20 household stereo systems randomly selected from a neighborhood. 12 6 4 9 11 1 7 8 9 8 9 13 5 15 7 6 8 8 2 1 Set up your own intervals and determine the frequency distribution. I suggest intervals of width three starting with intervals 1-3, 4-6, 7-9, etc... Describe the shape of the histogram. 4) The costs (in dollars) of 10 paperback college textbooks are listed below. Find the range, mean, and sample standard deviation. 70 72 71 70 69 73 69 68 70 71 5) At a tennis tournament a statistician keeps track of every serve. The statistician reported that the mean serve speed of a particular player was 104 miles per hour (mph) and the standard deviation of the serve speeds was 8mph. Assume that the statistician also gave us the information that the distribution of the serve speeds was bell-shaped. What proportion of the player's serves is expected to be between 112 mph and 120 mph