Monday, October 16, 2006

Math Questions & Answers Page E-50 Part VI (# 2)

A spinner is shown at the right for which each outcome is NOT equally likely.

If you spin the spinner once, what is the probablity that it will stop on A?

The probablity of the spinner landing on A after one spin would be Pa=2/4, or simplified to Pa=1/2, because A takes up half or two quarters of the spinner. (A/AllOtherAreas)

If you spin the spinner once, what is the probablity that it will stop on B?

The probablity of the spinner landing on B after one spin would be Pb=1/4, because B takes up 1 quarter of the spinner. (B/AllOtherAreas)

If you spin the spinner 50 times, about how many times would you expect it to land on A?

You would expect the spinner to stop on A about 25 times, because the probablity of getting A is 1/2. And 25 is half of 50.

If you spin the spinner 80 times, about how many times would you expect it to land on C?

You would expect the spinner to stop on C about 20 times, because the probablity of getting C is 1/4. And 20 is one quarter of 80.

--{*Create-A-Question*}--

Pretend B took up about 40% (2/5) of the spinner, and C took only 10% (1/10) of the spinner.

Then, if you spinned the spinner 20 times, how many times would it land on B?

Or on C?

Or A?

-apuya