00:01
Yes, hello.
00:01
So for part 8, so the probability here of x being equal to 4, that's going to be equal to 10 choose 4, but then times 0 .267 to the 4th, and then times 1 minus 0 .267 to the 6th.
00:24
So working that out, that should work out to be about 0 .126.
00:31
And then the probability of fewer than three do not cover their mouth.
00:37
That's going to be equal to p of x equals 0 plus p of x equals 1 plus p of x is equal to 2.
00:43
So that's going to give us that the probability of x less than 3 is going to be approximately.
00:50
So probability of x equals 0 is going to give us about 0 .052.
00:58
Again, that's going to be 10 choose 0 times .267 to the 0 times .733 to the 1.
01:05
And then we do plus p of 1, which is 10 choose 1, times .267 to the 1 times 0 .7 to the 9th, which should be about 0 .187.
01:17
And then we do plus p of x equals 2, which is 10 choose to, times .267 to the 2 times .73 to the 8th...