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Find the mode of the following data: Cl...

Find the mode of the following data:
Class :0-20, 20-40 ,40-60 ,60-80
Frequency:15, 6,18,10

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Highest frequency =12
Modal class =60-80
`1=60, F_{0}=10, F_{1}=12, F_{2}=6, h=20`
Mode =1+`(frac{F_{1}-F_{0}}{2 F_{1}-F_{0}-F_{2}}) times h`
...
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