SOLUTION: A widely held opinion is that approximately 45% of college students wished they could dance. Assuming the truth of that opinion let equal the number of students in a random samp

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Question 805810: A widely held opinion is that approximately 45% of college students wished they could dance. Assuming the truth of that opinion let equal the number of students in a random sample of size n=12 who wish they could dance. Find the probability that
(a) x is at most 5,
(b) x is at least 6,
(c) x is equal to 7.
(d) Give the mean, variance, and standard deviation of x

Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
I do here part d)
mean = np = 12(0.45)5.4
variance = np(1-p) = 12(0.45)(0.55) = 2.97
st dev = sqrt(2.97) = 1.723
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Thanks