Question 755627
Q:
study find that 80% of student text while doing home work. ten students selected. find the probability that at most 7 student of 10 text while doing homework .
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A:
X~Binomial(10, 0.8)
P(X ≤ 7) = {{{sum((matrix(2,1,10,x))(0.8^x)(0.2^(10 - x)), x = 0, 7)}}} = {{{highlight(0.3222)}}}