Table : TABLE A.4 STANDARD DEVIATION FOR SAMPLE A

X
9	9 − 30 = −21	−21² = 441
10	10 − 30 = −20	−20² = 400
15	15 − 30 = −15	−15² = 225
23	23 − 30 = −7	−7² = 49
25	25 − 30 = −5	−5² = 25
32	32 − 30 = 2	2² = 4
35	35 − 30 = 5	5² = 25
45	45 − 30 = 15	15² = 225
48	48 − 30 = 18	18² = 324
58	58 − 30 = 28	28² = 784