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20 February, 12:17

During an experiment, a spinner landed on green 9 times, which resulted in an experimental probability of 1/6. Mary said that there must have been 45 trials in the experiment. Why is Mary incorrect?

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  1. 20 February, 13:05
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    Because if there was 45 trials, and u landed on green 9 times ... the resulting probability would be 9/45 which reduces to 1/5, not 1/6.

    however, if there were 54 trials, and u landed on green 9 times ... the resulting probability would be 9/54 which reduces to 1/6.
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