Medal
A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of customer purchase for the models are as follows:

x 13.5 15.9 19.1
P(x) 0.2 0.5 0.3
Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 0.4 cubic feet smaller. What is the standard deviation in the actual size of the freezers purchased by all customers?
A. 1.6
B. 2.0
C. 3.6
D. 4.0

Question

Medal
A appliance dealer sells three different models of freezers having 13.5, 15.9, and 19.1 cubic feet of storage space respectively. Suppose the probabilities of customer purchase for the models are as follows:

x        13.5   15.9   19.1
P(x)     0.2     0.5     0.3
Now suppose the sizes are measured inaccurately by the manufacturer, so that each model should be 0.4 cubic feet smaller. What is the standard deviation in the actual size of the freezers purchased by all customers?
	A.	1.6
	B.	2.0
	C.	3.6
	D.	4.0

anonymous · Answer

I know its not A, im thinking C, what do u guys think?