00:01
There is given a binormal distribution question here, and the number of trial denoted by n that was given as 7 here, and the probability of success, which was given as 0 .8 here.
00:11
So i can define the random variable x, which is binomally distributed, and the n here is 7, and the probability of success, which is 0 .8.
00:22
So remember the formula, which is when x is equal to x, it has the formula, which is nx combination times p to the power x, and 1 .1.
00:30
P to the power n minus x.
00:33
Let me just find that when x is equal to 3.
00:36
So that means there's a 7 -3 combination and 0 .8 to the power 3 and 1 minus 0 .8 to the power of 7 -3 which is 4.
00:44
So the 7 -3 combination, which is 7 -6 and 5 divided by 3 -factorial, these two are cancelled...