Formulas

Question 1

Mean from a data table

Answer 1

Sum of (Mid point of class interval x frequency)/ frequency total

Question 2

Outlier at upper end

Answer 2

Upper quartile+ (1.5 x IQR) <

Question 3

Outlier at lower end

Answer 3

Lower quartile - (1.5 x IQR) >

Question 4

Standard deviation

Answer 4

Square root of ( sum of (frequency x midpoint2)) - ( largest class x mean2) / largest class - 1

Question 5

Box plot positively skewed

Answer 5

UQ- median > median - LQ

Question 6

Box plot negatively skewed

Answer 6

UQ - median < median - LQ

Question 7

Outlier at upper end ( using SD )

Answer 7

( 2 x SD) + mean <

Question 8

Outlier at lower end ( using SD)

Answer 8

( 2 x SD) - mean >

Question 9

Midrange

Answer 9

Largest value + smallest value / 2