00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In the question here we are going to discuss about the binomial distribution.
00:11
Let me remind you that if we have the x that follows by the binomial with the n and the b and then we will have the probability of the x equal to k, it will equal to n choose p power k times 1 minus b power n minus k now in this question here we have the 31 % the adult in the certain country have the hypertension it means that we have the p equal to the 1131 now we have the group under 21 adult it will define the x that will equal to the number of the adult that have the hypertension and then we see that x will follow by the binomial when the a .n equal to the 21, the p equal to zabon 31.
01:14
Now in the question a, when you find the probability exactly 5, then have a hypertension.
01:21
So when to find probability x into the 5, to find this probability, we apply this formula with the an and the p, then we have the 21 choose 5, 0 .31 power 5, 1 minus 1 equal to zon 69 power 21 minus 5 will be the 16 and then if we compute this one we get here and equal to the 21 p equal to the zupon 31 x equal to the 5 then we get equal to the zupon 15 i will round the answer to the 4 decimal places 1538 and then and that's going to be the answer for the 8.
02:15
For the p, we want to find the probability that more than 7.
02:19
So x squared than 7.
02:21
This one can be turned into the summation.
02:24
K starting from 8, up to the end will be the 21.
02:28
And then we have the 21 choose k, 0 .31 power k, 0 .69 power 21 minus k...