Selection by random numbers
a. Lay the strings out on a table, and number them from 1 toN.
b. Select 10 strings by choosing 10 random numbers between 1 and N and matching those numbers to the strings.
c. Measure the length of the sampled strings, and calculate the average.
d. Report the average to the instructor, who will provide you with all the aver, ages recorded in the class.