measures of central tendency, grouped data L6

to solve for the mean of the grouped data, use the formula

is the mean$

is the sum of the products of the frequency and its corresponding class mark

is the total frequency

class mark

is the mid value of the class interval. it can be solved by adding the lower-class limit and upper-xlass limit and divided by 2.

to solve for the median of grouped data, use the formula

median

is the lower boundary of the median class

is the cumulative frequency immediately below/lower than the median clsss

is the frequencyy of the median class

median class

is the class size

to solve for the mode of grouped data, use the formula

is the mode

is the lower boundary of the modal class

is the difference between the frequencies of the mofal class and the next lower class

is the difference between the frequencies of the modal class and the next upper class

is the class size