00:01
Hi, i'm david and i'm here to have you answer your question.
00:03
Let me bring up your question here.
00:06
In this question, let me summarize the question by the next question.
00:09
Here we have an exam consistent 25 multiple choices questions.
00:13
Each other of 25 answers is either right or wrong.
00:17
Suppose that the probability that the student makes this one make feel of than five mistakes is 0 .03.
00:27
So probability that i will call x, it will be equal to the number.
00:31
On the mistakes will be easier so probability here x smaller than five mistakes it will equal to 0 .33 and then next the probability another student makes a mistake on the exam makes fewer than five mistakes it will be 0 .03 and make from 5 to 10 mistakes so five to 10 mistakes including so means that x between the 5 to 10 it will equal to the 0 .25.
01:10
From here we are interested in the probability of the x greater than the 10 and equal to the 25 mistake it will equal to how much.
01:27
This one by the common month which you need to take the 1 minus the 0 .3 minus 0 .0 .25, then we should get equal to 1 minus 0 .33, minus 0 .25 can equal to the 0 .42.
01:46
And now we are able to answer the question now...