Probability Question.

• Oct 11th 2008, 06:41 PM
Skoz
Probability Question.
1. In the game of Bingo, the numbers 1 to 75 are marked on balls and drawn from a container that constantly mixes the balls. Fifteen balls, numbered 1 to 15, are marked with a B; the next fifteen with an I; and so on.

a) What is the probability that an O is drawn first? Ans: 1/5

b) What is the probability that a multiple of 5 is drawn first? 1/5
• Oct 11th 2008, 06:59 PM
mr fantastic
Quote:

Originally Posted by Skoz
1. In the game of Bingo, the numbers 1 to 75 are marked on balls and drawn from a container that constantly mixes the balls. Fifteen balls, numbered 1 to 15, are marked with a B; the next fifteen with an I; and so on.

a) What is the probability that an O is drawn first? Ans: 1/5

Mr F says: 5/75 .....

b) What is the probability that a multiple of 5 is drawn first? 1/5

Mr F says: How many multiples of 5 are there in the first 75 numbers? Now divide that number by 75 .....

..
• Oct 14th 2008, 12:40 PM
djmccabie
wouldnt part a be 15/75 ?
• Oct 14th 2008, 12:44 PM
mr fantastic
Quote:

Originally Posted by djmccabie
wouldnt part a be 15/75 ?

Correct. My typo.