Using the telephone numbers listed in your local directory asyour population ran

Using the telephone numbers listed in your local directory asyour population randomly obtain 20 samples of size 3. From eachtelephone number identified as a source take the fourth fifthand sixth digits.a. Calculate the mean of the 20 samplesb. Draw a histogram showing the 20 sample means. (Use classes -0.5to 0.5 0.5 to 1.5 1.5 to 2.5 and so on).c. Describe the distribution of the x-bars that you see in part b(shape of distribution center and the amount of dispersion).d. Draw 20 more samples and add the 20 new x-bars to the histogramin part b. Describe the distribution that seems to bedeveloping.