Engineering Archives - L - Basic Formulas

Basic Formulas

Measure of Location

Mean:

The average of the values in an array

=

1

n

n

Σ

1

x_i

Median:

The middle value in an array

Mode:

The value with the greatest frequency of occurrence

Measure of Dispersion

Variance:

s² =

1

n – 1

n

Σ

1

(x_i –

)²

Standard Deviation:

s²

Mean Deviation:

1

n – 1

n

Σ

1

x_i –