Question: what is the formula for standard deviation of ungrouped data?
Answer: ¯ X = ΣX/n = 30/5 = 6. −22 = 4 02 = 0 22 = 4 42 = 16 Page 8 SS 201 – Oct. 11, 2006. Standard deviation for ungrouped data 8 • Sum the squares of the differences about the mean to obtain Σ(X − ¯ X)2 = 16 + 4 + 0 + 4 + 16 = 40. n − 1 = 40 4 = 10. n − 1 = √ 10 = 3.162.