There were 13 babies born at the Edson Hospital in Alberta in one day. The babies' weights, in grams, were: 2760, 2230, 2930, 1540, 2890, 2912, 2720, 3750, 3190, 3650, 3890, 4210, 4420
a) Your baby weighed 2930 g. What was your baby's percentile rank for weight?
b) Michelle's baby weighed 3620 g. What was her baby's percentile rank for weight?
c) What is the percentile rank for weight of the heaviest baby?
To find the percentile rank for weight of a baby, you need to first determine how many babies were born with a weight below the baby in question, then divide that number by the total number of babies born, and finally multiply by 100 to get the percentile rank.
a) Your baby weighed 2930 g. There were 7 babies born with a weight below 2930 g. So, the percentile rank for weight of your baby is (7/13) * 100 = 53.8%.
b) Michelle's baby weighed 3620 g. There were 9 babies born with a weight below 3620 g. So, the percentile rank for weight of Michelle's baby is (9/13) * 100 = 69.2%.
c) The heaviest baby weighed 4420 g. There were 13 babies born in total, so the percentile rank for weight of the heaviest baby is (13/13) * 100 = 100%.