Hey there! We receieved your request
Stay Tuned as we are going to contact you within 1 Hour
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-5470-145
+91 7353221155
Use Coupon: CART20 and get 20% off on all online Study Material
Complete Your Registration (Step 2 of 2 )
Sit and relax as our customer representative will contact you within 1 business day
OTP to be sent to Change
In an entrance test there are multiple choice questions. There are four possible answers to each question, of which one is corret.The probability that a student know the answer to a question is 9/10.If he gets the correct answer to a question, then the probability that he was guessing is
(post ur ans in Step by step understandable way)
E1=he guesses the answer
E2=he knows the answer
given P(E2)=9/10
as they are mutually exclusive then P(E1)+P(E2)=1
so P(E1)=1/10
A=he answers correctly
P(A/E1)=he guesses and answers correctly=1/4
as there are 4 options and only one can be correct by guessing
P(A/E2)=he gives correct answer as he knows the answer=1
if one knows the answer he will obviously give correct answer
now using baye''s theorem
P(E1/A)=we know answer is correct and we have to take out probability that he guessed and gave correct answer=
P(E1)*P(A/E1)/(P(E1)*P(A/E1)+P(E2)*P(A/E2))
putting values one can find answer.
Get your questions answered by the expert for free
You will get reply from our expert in sometime.
We will notify you when Our expert answers your question. To View your Question
Win Gift vouchers upto Rs 500/-
Register Yourself for a FREE Demo Class by Top IITians & Medical Experts Today !