Explore BrainMass

Explore BrainMass

    Random Variables- Properties of Variance/Standard Deviation

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    A mason is contracted to build a patio retaining wall. Plans call for the base of the wall to be a row of 50 10-inch bricks, each separated by ½ inch thick mortar. Suppose that the bricks used are randomly chosen from a population of bricks whose mean length is 10 inches and whose standard deviation is 1/32 inch. Also suppose that the mason, on the average, will make the mortar ½ inch thick, but the actual dimension varies from brick to brick, the standard deviation of the thickness being 1/16 inch. What is the standard deviation of L, the length of the first row of the wall?

    © BrainMass Inc. brainmass.com October 2, 2022, 6:05 pm ad1c9bdddf

    Solution Preview

    We know that if the length of bricks and thickness of mortar are all independent random variables, we have the following ...

    Solution Summary

    Properties of variances and standard deviations are examined.