the first answer is correct.
For the second:
the random variable x has a binomial distribution with n=6 and p=0.2
calculate P(X=6), I have tried this question several times and suspect it it not that difficult however I keep coming out with the wrong answer.
Is it 6choose6 x 0.2^6 x 0.8^0 ??
also how would I go about calculating
Given that Z~B(9,0.45) calculate P(Z=4 or 5)
Any help would be great thanks