Question: 4.68 Suppose that the correlation is zero. Refer to Example 4.51 (page 248). a. Recompute the standard deviation for the total of the natural-gas bill

4.68 Suppose that the correlation is zero. Refer to Example 4.51 (page 248).

a. Recompute the standard deviation for the total of the natural-gas bill and the electricity bill, assuming that the correlation is zero.

b. Is this standard deviation larger or smaller than the standard deviation computed in Example 4.51?

Explain why.

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