Representation and Summary of Data - measures of dispersion. Flashcards
1
Q
To calculate the xth percentile, Px …
A
Find the value of the the (xn/100)th term.
2
Q
Deviation of a value from the mean is given by…
A
x-mean.
3
Q
State the general formulae for variance.
A
Mean of the square - square of the mean.
4
Q
State the general formulae for variance w/in a grouped frequency table.
A
5
Q
How do you calcullate stnadard deviation?
A
Square root variance.
