Height (in cm)	Frequency
Not exceeding 99.5	0
Not exceeding 109.5	27
Not exceeding 119.5	85
Not exceeding 129.5	215
Not exceeding 139.5	320
Not exceeding 149.5	370
Not exceeding 159.5	395
Not exceeding 169.5	400

(ii)

bi) Median 1/2 of N = 1/2 x 400 = 200
Cumulative frequency level From the curve, it is 118.5cm
(ii) Inter quartile range = upper quartile - lower quartile upper quartile
= 3/4 of N
= 3/4 x 400 = 300
Cumulative frequency level From the curve, it is 126.5cm
lower quartile = 1/4 of N
= 1/4 x 400 = 100
Cumulative frequency level From the curve, it is 111.0cm
Inter quartile range = 126.5cm -111.0cm = 15.5cm
(ii) From the curve, students whose heights are at most 130cm are 240.
Percentage óf students whose heights are at most 130cm = \(\frac{240}{400}\) x 100
= 60%