IV. The following table gives the frequency distribution of the number of hours spent last week on cell phones (making phone calls and texting) by all 100 students in the tenth grade at a school. Number of Students 14 18 Hours 0 to less than 4 4 to less than 8 8 to less than 12 25 12 to less than 16 18 16 to less than 20 16 20 to less than 24 9 Find the mean, median, mode and variance.