Find median of the following data.
Wages 60-70 50-60 40-50 30-40 20-30
No. of workers 7 21 11 6 5
Answers
Refer to the attachment.
Median is 51.43
Wages no. of workers(f) cumulative frequency(c.f.)
20-30 5 5
30-40 6 11 N/2 = 50/2 = 25
40-50 11 22
50-60 21 43______ Median class
60-70 7 50
∑ 50
Median = L + [ ( n/2 - c.f.) / f ] * h L = lower limit of median class
= 50 + [ ( 25-22 ) ] / 21 ] * 10 c.f. = cumulative frequency of
= 50 + 1.43 preceding class.
= 51.43 f = frequency of median class
h = size of class
n = no. of observations.