Formulas

Question 1

Formula for N

Answer 1

1) Σ frequency
2) N/2 = N

Question 2

Formula for Median or (M)

Answer 2

N = L + (N/2-Cf)H/F

Question 3

Formula for Mean (X)

Answer 3

Mean = Σ Xm(f)/N

Question 4

Formula for variance (S^2)

Answer 4

Σ (Xm-X^2)F/N-1

Question 5

Formula for standard deviation

Answer 5

Squareroot ——-> Σ (Xm-X^2)F/N-1

Question 6

How to get H?

Answer 6

Get the first last term at the bottom and subtract

Question 7

How to get XM ?

Answer 7

Add the lower and higher boundaries then divide by 2

Question 8

How to get XM ?

Answer 8

Add the lower and higher boundaries then divide by 2

Question 9

How to get CF?

Answer 9

Write the first frequency then add to the lower or next frequency beneath it.
Like: 3 3
7 10
8 18