Thread: Spinner

A spinner contains eight regions, numbered 1 through 8. The arrow has an equally likely chance of landing on any of the eight regions. If the arrow lands on the line, it is spun again. What is the probability that the arrow lands on an odd number?

Originally Posted by symmetry

A spinner contains eight regions, numbered 1 through 8. The arrow has an equally likely chance of landing on any of the eight regions. If the arrow lands on the line, it is spun again. What is the probability that the arrow lands on an odd number?

The odd numbers, 1-8, are 1, 3, 5, 7, thus there are 4 odd numbers out of the 8, and therefore the probability that the arrow lands on an odd number is 4/8 or 1/2.

I thank you for your great help.