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Probability from stem and leaf plot

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The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39?

2 0 2 6 7 9
3 0 3 4 5 6 8 8 9 9
4 2 4 5 6 7
5 2 3 4 7
6 1 3

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Calculation of probability from stem and leaf plot is discussed here.

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