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(a)Assuming that we toss a in-balanced coin for 100 times, and we get 40 heads from...

(a)Assuming that we toss a in-balanced coin for 100 times, and we get 40 heads from our experiment. Assuming that the relative frequency is just the true probability for tossing to get a head. Then we want to know:

Probability for getting a head:  

Expected variance if tossing 70 times:  

(b)Given a poisson distribution with expectation 4, so the standard deviation of this distribution should be

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