100 Laptop use in middle school. Many middle schools have initiated a program that provides every student with a free laptop (notebook) computer. Student usage of laptops at a middle school that participates in the initiative was investigated in American Secondary Education

(Fall 2009). In a sample of 106 students, the researchers reported the following statistics on how many minutes per day each student used his or her laptop for taking notes:

x = 13.2, s = 19.5

a. Compute the interval, x { 2s .

b. Explain why the distribution of laptop usage for taking notes for these 106 students cannot be symmetric.

c. Given your answer to part b , what percentage of the 106 students have laptop usages that fall within the x { 2s interval?