00:01
So here we are given probability p to be 20%, which is 0 .2, which is 1 minus p, is 1 minus 0 .2, and here 0 .30, and is given us 8.
00:14
So our x will be binomially distributed parameters and is equal to 8 and p to be 0 .2.
00:22
So for part c, we are asked to find probability of purchasing more than sex, win, win, ticket.
00:33
So this will be probability of x is equal to 7 plus probability of x is equal to 8.
00:39
So we are going to use the probability mass function of binomia, which is n choose x times p to the power x times q to the 4 and 9 is x.
00:51
So for probability of x greater than 6, we get, so for probability of x is equal to 7, we get 8 choose 7 times 0 .0 .6.
01:06
2 to the power 7 times 0 .8 to the power 8 minus 7 plus 8 choose 8 times 0 .2 to the power 8 times 0 .8 to the power 8 minus 8.
01:26
And this gives us 0 .0084...