basic stats help

Q1 in data representing distribution of speed (miles per hour) traveling down a highway, organize the data into frequency distribution (f) and relative frequency (rf) in columns, using;56,80,64,70,76,79,67,72,65,73,68,65,67,65,70,62,67,68,65,64. 2. calculate the mean, medium, and mode for the data set in exercise 1. is the distribution normal or skewed? which measure of central tendency is most appropriate for this disribution? why? 3. calculate the range and standard deviation for the following five distributions; a.1,2,3,4,5,6,7,8,9 b. 4,3,2,1,0,1,2,3,4, c. 10,20,30,40,50,60,70,80,90 d 0,1,0,2,0,3,0,4,0,5,0,6,0,7,0,8,0,9 e. 100,200,300,400,500,600,700,800,900