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The probability mass function (pmf) for a bernoulli experiment involving the tossing of 10 independent coins, where each coin has a probability of 4/5 of landing heads up. The pmf is given by the formula in the document and is used to compute the probability of getting exactly 3 heads in the experiment.
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4
5
for each
coin. Let X = 1 if we get exactly 3 heads, and X = 0 otherwise. Compute the probability
mass function p X of X.
R. Sowers 1
Answers
p X (j) =
10
3
4
5
3
1
5
7
if j = 1
10
3
4
5
3
1
5
7
if j = 0
0 else
R. Sowers 2