00:02
Part a, probability of coming head, which is p is .55.
00:20
And probability of coming tail, which is q is equal to 1 minus p, is 1 .55.
00:37
0 .5.
00:43
Now, px equal to, we need to find the probability of x is equal to 5.
00:59
Using geometric distribution, probability of x is equal to x, which is equal to q to the power x minus 1, p.
01:14
Px is equal to 5 is 0 .45 to the power 5 minus 1.
01:23
Point px is equal to 5 is 0 .0 to 6 rounded to 4 decimals.
01:34
Now part b.
01:36
Given tails come up on the first three flips.
01:40
We have to find the probability that the first time that hat comes up is one fifth flip.
01:49
So on the fourth lip, tail must comes up.
01:53
So for this given, p is 0 .55...