Formulas Flashcards
1
Q
Formula for N
A
1) Σ frequency
2) N/2 = N
2
Q
Formula for Median or (M)
A
N = L + (N/2-Cf)H/F
3
Q
Formula for Mean (X)
A
Mean = Σ Xm(f)/N
4
Q
Formula for variance (S^2)
A
Σ (Xm-X^2)F/N-1
5
Q
Formula for standard deviation
A
Squareroot ——-> Σ (Xm-X^2)F/N-1
6
Q
How to get H?
A
Get the first last term at the bottom and subtract
7
Q
How to get XM ?
A
Add the lower and higher boundaries then divide by 2
8
Q
How to get XM ?
A
Add the lower and higher boundaries then divide by 2
9
Q
How to get CF?
A
Write the first frequency then add to the lower or next frequency beneath it.
Like: 3 3
7 10
8 18
