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How to calculate the Standard Deviation of grouped data step by step? Step 1: Make the frequency distribution table with 6 columns. ... Step 2: Find N = ?ni=1 fi. Step 3: Find the midpoint of each class. ... Step 4: Find fixi (product of frequency and mid-point). ... Step 5: Find x? using the formula (1/N) ?ni=1 fixi.
The variance of a sample for grouped data is: s2 = ? f (m ? x?)2 / n ? 1.
CV = standard deviation / sample mean x 100 = CV = volatility / projected return x 100 = CV = (0.03) / (0.15) x 100 = 0.2 = 20%
Variance(?2)=?(x?¯x)2n=(2?6)2+(4?6)2+(6?6)2+(8?6)2+(10?6)25=(16+4+0+4+16)5=405=8. Q.