Calculate standard deviation from short cut method: X f 5 26 10 29 15 40 20 35 25 26 30 18 35 14 40 12
Pragya,
X | f | dx = X - A (A= 25) | fdx | ||
5 | 26 | -20 | 400 | -520 | 10400 |
10 | 29 | -15 | 225 | -435 | 6525 |
15 | 40 | -10 | 100 | -400 | 4000 |
20 | 35 | -5 | 25 | -175 | 875 |
25 | 26 | 0 | 0 | 0 | 0 |
30 | 18 | 5 | 25 | 90 | 450 |
35 | 14 | 10 | 100 | 140 | 1400 |
40 | 12 | 15 | 225 | 180 | 2700 |