Question

can someone look at this problem and tell me how they found the 45 please
P(X=2)=(10 2) (0.25)^2 (0.75)^8
45 (0.25)^2 (0.75)^8
=.2816

Answer 1

@satellite73

Answer 2

If 10 employed women are selected at random, what is the probability that exactly 2 have been married?
n=10, p=0.25

Answer 3

http://www.wolframalpha.com/input/?i=10+choose+2

Answer 4

\(\large \binom{10}{2} = ^{10}C_2 = \dfrac{10!}{2!(10-2)!}\)

Answer 5

its the number of ways of choosing 2 objects from a set of 10 objects.

Answer 6

The formula is :

\(\large \binom{n}{r} = ^{n}C_r = \dfrac{n!}{r!(n-r)!}\)