The heights in centimetres of 30 children are given below. Prepare a frequency
table and find their mean height.
135 137 130 135 137 140 135 137 132 135
140 135 131 139 140 140 138 136 137 135
132 131 130 134 135 140 138 137 136 131
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Step-by-step explanation:
Minimum height =131cm
Maximum height =156cm
Range =156−131=25
Number of classes =4
Class range =425=6.25 approx 6
class 1=131+6=137
class 2=137+6=143
class 3=143+6=149
class 4=149+6155
class 5=155+6=161
Class interval Frequency
131−137 9
137−143 3
143−149 2
149−155 4
155−161 2
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