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1. Find the mean absolute deviation 2. Find the standard deviation using the two formulas. Note that you should arrive at the same answer LL

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1. Find the mean absolute deviation 2. Find the standard deviation using the two formulas. Note that you should arrive at the same answer LL UL X X- mean Lower Upper frequency Class limit limit Mark 11 15 11 16 20 17 21 25 22 26 30 15 31 35 10 3. Show that the formula for SD = nEfx2-(Efx)2 n(n-1) can be derived from the first formula for SD = Ef(x-xbar)2 n-1

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