Question

If the average height of the students of 20girls in the class is 130cm and the average height of the 20boys is 134cm what is the avarage height of the all students in the class?​

Answer 1

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Minimum height =131cm

Maximum height =156cm

Range =156−131=25

Number of classes =4

Class range =

4

25

=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