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Standard deviation = √(Σfx²/Σf - (Σfx/Σf)²)
Mid-points represent typical values for class intervals.
fD = Frequency × Mid-point of the class interval.
Σf is the sum of all frequencies in a dataset.
Mean = 300/60 = 5.
Calculate the mean of the data set.
We assume all values are at the mid-point of intervals.
Mean of D² = 2000 / 50 = 40.
Calculate the mean and then apply the SD formula.
Narrow intervals yield more accurate estimates.
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