A survey of 200 automobiles results in the following distribution: Age of Auto in Years f 0 and under 2 29 2 and under 4 43 4 and under 8 66 8 and under 15 38 15 and under 25 24 Total 200 a. Calculate the mean age for all the autos examined. b. Calculate the median age for the autos. c. What is the modal class for these observations? d. Calculate the standard deviation