Question

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

Answer 1

Step-by-step explanation:

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

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Answer 2

Minimum height =131cm

Maximum height =156cm

Range =156−131=25

Number of classes =4

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