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Employees were asked how many times per week they exercised. The frequency table shows the results of the survey.

Employees were asked how many times per week they exercised. The frequency table shows-example-1
User BobGao
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Solution

Total frequency = 5+10+2+9+33+12+15+3+1 = 90

(a) Create a probability distribution table

(b) P(x<4) =


\begin{gathered} P(x<4)=p(x=1)+p(x=2)+p(x=3) \\ p(x<4)=(5)/(90)+(10)/(90)+(2)/(90)+(9)/(90) \\ =(5+10+2+9)/(90) \\ =(26)/(90) \\ =0.2889 \\ \approx0.29\text{ \lparen nearest hundredth\rparen} \end{gathered}

Employees were asked how many times per week they exercised. The frequency table shows-example-1
User Blazs
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