Question 549537
Binomial probability: a card is randomly selected from the deck and its shape and number are recorded. suppose this is repeated 10 times. what is the probability that exactly: 
a. four out of then are squares. 


in the figure it shows 5 triangles numbered 1 2 2 3 3 
4 circles numbered 1 1 2 3 
6 squares numbered 1 2 2 2 3 3 
i know the formula 
nCkpKp(N-K) 
10C4p4p10-4 
i don't know how to get the p
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Binomial Problem with n = 10 and p(square) = 6/15
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P(x = 4) = 10C4*(6/15)^4*(9/15)^6 = = binompdf(10,6/15,4) = 0.2508
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Cheers,
Stan H.
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