Statistics maybe binomial distrubution

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Oct 10, 2007, 09:51 AM

mouse26

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Join Date: Oct 2007

Posts: 2

Statistics maybe binomial distrubution

Hi everyone
I am having some trouble with the following questions. If anyone could help me out that would be great! Thanks a lot!!

Here are the questions:
Let X represent the number of heads when a fair coin is tossed 20 times. Let Y represent the number of sixes that appear when a six-sided die is tossed 50 times. It is reasonable to assume X and Y are independent.
#1. What is the expected value of X + Y?
#2. What is the variance of X + Y?
#3. What is the standard deviation of X – Y?

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