30 points! plz ! the list shows the number of children who visited a city playground each day for two weeks. 13 24 30 25 38 26 10 9 16 35 42 31 15 42 describe appropriate intervals for the horizontal axis for the histogram of the data

Answer to first part 1: First you obtain number of intervals you would like to have by getting the square root of the total number of observations. In this case, square root of 14 = 3.74; round up and use 4.0.
Answer to Second part: 2:  The interval width is then obtained by dividing the range by the number of intervals. For this case, interval width = (42-9)/4 = 8.25. This can be rounded up to the convenient evenfigure of 10.0.

Hope this helps