Friday

November 28, 2014

November 28, 2014

Posted by **indranil chatterjee** on Monday, May 2, 2011 at 12:56pm.

- Maths -
**David**, Monday, May 2, 2011 at 3:22pmSay the probability he'll pass English is Prob(E) = 0.6. The probability he'll pass in both English and Maths is Prob(E&M) = 0.54. Provided the probability that he'll pass English is independent of the probability that he'll pass Maths (and note that's an assumption we're making that may or may not be true), then the probability that he'll pass Maths must be Prob(M) = Prob(E&M) / Prob(E) = 0.54/0.6 = 0.9, because Prob(E&M) = Prob(E) x Prob(M) if the events are independent. So Prob(M) = 0.9. But we were asked for the probability that he'll fail Maths, not pass it, and that's 1 - Prob(M). So the answer must be 1 - 0.9 = 0.1. Do you agree?

**Answer this Question**

**Related Questions**

statistics - in a class of 40 student,18 pass maths, 19 pass account,16 pass ...

Probality - in a case in riverhead, New York, nine different crime victims ...

maths - A coin is biased so that a head is twicw as likely to occur as a tail. ...

to ms sue - do you how to do probality? if so can you look at my question

Probality - The probability that at most 3 tosses of a balanced dice are ...

Probality - The probability that a prime number occurs on at least 2 tosses when...

MATHS - in a class of 60 students,the number of students who pass biology is 6 ...

Math - What is the probality of rolling a number less than or equal to 2 on the ...

math - if 2 socks are chosen at random,what is the probality of getting first a ...

Math - Students are given three chances to pass a basic skills exam for ...