Question

The Ontario Lottery and Gaming Corporation states that probability of winning $5 on a $2 scratch ticket is 1 in 10. If a person buys one scratch ticket every day for a week, the probability that he or she will win $5 twice is

Question 2 options:

18%


10%


1%


12%

Answer 1

\[\dbinom{7}{2} (.1)^2(.9)^5\]

Answer 2

\[\dbinom{7}{2}=\frac{7\times 6}{2}=7\times 3=21\] but you need a calculator for the rest

Answer 3

i get
http://www.wolframalpha.com/input/?i=21*.1^2*.9^5
about 12%

Answer 4

Where did you get 0.9 from?

Answer 5

@satellite73

Answer 6

Oh, was the 0.9, the probability that one would lose?

Answer 7

probability you win is .1, probability you lose is 1-.1=.9

Answer 8

Okay, I get it now! Thanks

Answer 9

win twice, lose 5 times

Answer 10

yw