00:01
Hi, i'm david and i'm here to help you answer the question.
00:04
Now let me pick up the question here.
00:07
In this question we're going to discuss about the binomial distribution.
00:11
Let me remind you that, i'm going to the x followed by the binomial with the n and the p.
00:17
And then the probability of the x equal to k, equal to n choose k, p b b times 1 minus p b b, and also the expected of the x equal to n times b variance of the x equal to the n times p times 1 minus b.
00:40
In this question here we have the symbol n equal to the 12 students and we know that the 20 % of the students attended that festival.
00:53
So p equal to the 0 .2 and now if we call the x equal to the number of the students that attend the festival.
01:15
And then we will see x followed by the binomial with the n equals to 12.
01:22
P equal to the 0 .2.
01:26
And therefore the question i asked let you give the distribution of the x.
01:31
So x just followed by the binomial.
01:35
Then b equal n equal to 12, b equal to the 0 .2.
01:41
Now for the question b, we want to find expected value of the x.
01:48
So by formula equal to n times b here, and then we get equal to the 12 times the 0 .2...
