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# Need help with probability question please?

A spinner has three numbers on it. 1,3 and 5. Ann thinks the spinner is not fair, and thinks it's more likely to point to five then the other two numbers.

Describe how she could find the true probability of getting a five?

So, would the answer be she would have to spin it five times and see how many times it lands on five?

### 1 Answer

- eDennisLv 69 years agoFavorite Answer
This is a bit more complicated than it sounds, as even if the spinner was fair, it could come up 5 a large number of times.

To do this problem properly you would set up the null hypothesis that the spinner was fair.

Then you count the number of 1's, 3's, and 5's and see how different these results were from the expected, assuming a fair spinner. Finally you would use a chi-square random variable to quantify the likelihood of seeing your result. A bit much, eh?