\left. \begin{array} { c c c } { 0 - 10 } & { 10 - 20 } & { 20 - 30 } – InterviewSolution

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1.	\left. \begin{array} { c c c } { 0 - 10 } & { 10 - 20 } & { 20 - 30 } & { 30 - 40 } & { 40 - 50 } \\ { 7 } & { 10 } & { 15 } & { 8 } & { 10 } \end{array} \right.
Answer» take out mid terms of each range 5,15,25,35,45so mean=(5×7+15×10+25×15+35×8+45×10)/(50)=1290/50=25.8

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