I came up with 7 bins with width of 1 marble each. The distribution of the marbles in the 7 bins is 2, 15, 62, 98, 62, 15, 2. How I got these numbers is I found the probabilities P(-3.5<z<-2.5), P(-2.5<z<-1.5),…,P(2.5<z<3.5) using the Standard Normal Distribution Calculator. Then I multiplied...