A randomly selelected group of individuals were asked how many marbles they believed were contained in a sealed jar. The following frequency distribution summarizes the results. Complete the table by determining the midpoints, relative frequencies, and cumulative frequencies. You may answer using decimals to three places when necessary Marbles Frequency Midpoints Relative Frequency Cumulative Frequency 140 - 144 145 - 149 4 150 - 154 11 155 - 159 12 160 - 164 8 What is the class width of this frequency distribution