Six fair nickels are tossed, and the total number N of heads is observed. Then N fair dimes are tossed, and the total number Z of tails among the dimes is observed. Determine: (A) The expected value E[Z] of Z. (B) The variance V[Z] of the random variable Z. (C) The probability P{Z

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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the answer is two. hope this !

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5,-10,20,-40,30,-60

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