Question: hi I have question about this problem. I understand a) is like 4 or n/4 naturally but I can't explain well. could you explain a?

hi I have question about this problem. I understand a) is like 4 or n/4 naturally but I can't explain well. could you explain a?

A coin has 1/4 chance of having heads, 3/4 chance of having tails. It is tossed n times. a) What is the expected number of coin tosses needed to get a heads? b) What is the probability that the number of heads equals the number of tails? Write the expression using (2') notation, and then see if you can approximate What this gives

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