A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is...?

selected at random from the shelf, find the probability that the book selected is a biography or reference book. (question)





a. 1/2


b. 1/6


c. 5/6


d. 3/50

A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is...?
Hi,





There are 10 books total on the shelf. Of those, 5 are either a biography or a reference book. Therefore, your odds are 5 out of 10, which reduces to 1/2, that that is what was selected.





Answer A





I hope that helps.
Reply:it is 3(BIO) + 2(REF) = 5/ 10(4+3+2+1 total no of books) = 1/2
Reply:there are 10 books in total on the bookshelf....


there are 3 biography books and 2 reference books...


combining the number of biography books and reference books and you get 5 books........


5 out of 10 is.........1/2





therefore 1/2 is your answer....
Reply:Total books = 4+3+1+2 = 10





Number of biograghy or reference books = 3 + 2 = 5





Chance of biography or reference book = 5/10 = 1/2
Reply:I suck at math sorry


=D