1) The heights (in inches) of 30 adult males are listed below. 70 72 71 70 69 73 69 68 70 71 67 71 70 74 69 68 71 71 71 72 69 71 68 67 73 74 70 71 69 68 A frequency distribution shows the frequency and relative frequency using five classes. Height (in inches) Frequency Relative Frequency 67.0-68.4 68.5-69.9 70.0-71.4 71.5-72.9 73.0-74.4 a. Calculate the frequency and relative frequency for the following five classes. b. Which category of heights represents the mode? C. What proportion of the 30 adult males had heights less than 70 inches? d. Calculate the mean for the heights of these 30 adult males