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

User Aniruddh
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7.0k points

2 Answers

2 votes

Answer:

A

Explanation:

I got it correct on the test

User Tristar Web Design
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0 votes

Answer:

Mary is incorrect

Explanation:

We are given the following in the question:

Number of times the spinner landed on green color = 9

P(Green) =


(1)/(6)

Mary claimed that there must be 45 trials.


\text{Probability} = \displaystyle\frac{\text{Number of favourable outcomes}}{\text{Total number of outcomes}}

P(Green) =


\frac{\text{Number of times spinner landed on green}}{\text{Total number of trials}}\\\\\Rightarrow (9)/(x)=(1)/(6)\\\\\Rightarrow x = 9* 6 = 54

There are 54 trials in the experiment and not 45 trials. Thus, Mary is incorrect.

User Adam Westbrook
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