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I toss a coin two times. X1 is the number of heads on the first toss....

I toss a coin two times. X1 is the number of heads on the first toss. X2 is the number of heads on the second toss.

Find the mean of X1.

Find the variance of X1.

Find the mean of X1 + X2. (This is the number of heads in 2 tosses.)

Find the variance of X1 + X2.

If you tossed 10 coins, how many heads would you expect? What is the variance of the number of heads?

Math   Statistics-And-Probability   
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