Probability

EMPhillips1989 · 2008-02-01 05:56:41

In a school of 500 students, each were given one of three revision books
250 were given book A
150 were given book B
100 were given book C

A survey said that:
100 were satisfied with book A
75 were satisfied with book B
80 were satisfied with book C

if a student is selected at random and is satisfied with her book, which book A B or C are they most likely to have used?
which book is the student least likely to have used???

does anyone know how i would go about answering a question like this any help will be very much appreciated!!!:D

mathsyperson · 2008-02-01 07:14:19

I may be wrong, but I think the first set of data isn't actually relevant to this question - you can just read the numbers off the second set.

Therefore, a randomly selected satisfied student was most likely to have been given book A (because 100 is the highest in that table). Similarly, the least likely book is B.

EMPhillips1989 · 2008-02-01 07:20:14

yes but im not sure it can be done as easily as there is a greater percentage as 80 out of 100 students were more satisfied with book C, do you see where im coming from??

mathsyperson · 2008-02-01 07:34:34

It doesn't matter how big the original groups were, anyone who wasn't satisfied by their textbook is ignored.

Math Is Fun Forum

#1 2008-02-01 05:56:41

Probability

#2 2008-02-01 07:14:19

Re: Probability

#3 2008-02-01 07:20:14

Re: Probability

#4 2008-02-01 07:34:34

Re: Probability

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