Question

The table below gives the number of babies born in a hospital during a week, sorted according to their birth weight.

Weight (kg)	Number of babies
2.500	4
2.600	6
2.750	8
2.800	10
3.000	12
3-150	10
3-250	8
3-300	7
3-500	5

Calculate the median birth-weight

Answer 1

Weight (kg)	Number of babies
up to 2.500	4
up to 2.600	10
up to 2.750	18
up to 2.800	28
up to 3.000	40
up to 3-150	50
up to 3-250	58
up to 3-300	65
up to 3-500	70

Total number of babies = 70 

Half =35

So median is the weight of 35 baby. 

The weight of 35 111 child be in between 29 and 40 placed child, its weight will be 3 kg.

\(\therefore\) Median of the weight = 3 kg.