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Find the mean deviation about mean for the following data: `{:(x,1,3,7,9,13,14),(f,2,5,8,6,3,1):}`

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Find the mean deviation about mean for the following data:
`{:(x,1,3,7,9,13,14),(f,2,5,8,6,3,1):}`
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`bar(x) = "AM" = (sum fx)/(sum f) rArr bar(x) = (180)/(25) = 7.2`
`therefore "MD" = (sum fd)/(N) = (70)/(25) = 2..8`.
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