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If x is a binomial random variable, compute the probabilities for each of the following cases (no rounding):
(a) n=8,p=0.7, P(x≤6)=

(b) n=9,p=0.3, P(x>2)=

(c) n=6,p=0.6, P(x<4)=

(d) n=8,p=0.7, P(x≥3)=