STA301 Final Term Preparation Formulas

STA301 FINAL TERM PREPERATION FORMULAS (VISIT VURANK FOR MORE)

Formulas · FROM LECTURE 01 TO 22 · Mean:

∑ fX

∑ f · Weighted Mean: · ∑WX i

i

X w = ∑ · W i · Mean Deviation: · ∑d

M.D= n

∑ fi d i M.D =

∑ f

d = (X −X)

Coefficient of Mean Deviation:

M.D Co-efficient of M.D(for mean) = Mean

M.D Co-efficient of M.D(for median) = Median

Standard Deviation:

S.D =

∑ f (X − X)2 S.D =

∑ f

X X n Shortcut Formula for Ungroup data

∑x2

 ∑x

S.D = n n

Shortcut Formula for Group Data  ∑ fx2  ∑ fx

S.D =

∑ f

f

Co-Efficient of Standard Deviation:

S .D

X

Variance:

∑(X − X )2

Variance = n

∑ f (X − X )2