# Can you explain how to find probability?

A class contains 7 women and 7 men.  Suppose that we choose three random students. How many ways can we choose exactly 1 woman?

the probabilities that a batch of 4 computers will contain 0, 1, 2, 3, and 4 defective compiters are 0.4094, 0.4094, 0.1536, 0.0256, and 0.0016 respectively.  Fond the standard deviation for the probability distribution.  Round to the nearest hundredth.
answered Aug 5, 2012 by anonymous
men                             women

n=7                              n=7

r = 2                             r = 1

total outcomes= n = 14C3 = 364

favourable outcomes = m =  7C1 X 7C2

7  X 21

147

probability = m/n = 147/ 364

p=  0.403

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