Statistics

Question 1

M.D(mean)

Answer 1

Σ|xi - mean|/n

Question 2

M.D(M)

Answer 2

Σ|xi-M|/n

Question 3

variance & standard deviation for ungrouped

Answer 3

σ^2 = 1/n Σ(xi - mean)^2

Question 4

variance & standard deviation for discrete frequency distribution

Answer 4

σ^2 = 1/N Σfi(xi - mean)^2

Question 5

shortcut for V and SD

Answer 5

σ^2 = h^2/N^2 [NΣfiyi^2 - (Σfiyi)^2].σ

Question 6

yi =

Answer 6

(xi - A)/h

Question 7

coefficient of variation (C.V.)

Answer 7

σ/mean x 100