Data Processing

Mean (Ungrouped, Direct Method): X̄ = ∑x / N

Mean (Ungrouped, Indirect Method): X̄ = A + ∑d / N

Mean (Grouped, Direct Method): X̄ = ∑fx / N

Mean (Grouped, Indirect Method): x̄ = A ± ∑fd / N

Median (Ungrouped Data): Value of (N+1)/2 th item

Ungrouped direct mean: X̄ = ∑x / N

Ungrouped indirect mean: X̄ = A + ∑d / N

Grouped direct mean: X̄ = ∑fx / N

Grouped indirect mean: x̄ = A ± ∑fd / N

Ungrouped median: Value of (N+1)/2 th item

Grouped median: M = l + i/f (N/2 - c)

Mode: maximum occurrence or frequency at a particular point or value