The height of $20$ students of a class ( $c m$ ) are as given: $132, 131, 135, 136, 134, 132, 131, 142, 142, 152, 151, 151, 148, 145, 131, 132, 142, 156, 155, 152$ . Arrange the data in the form of table of grouped data frequency distribution.

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Solution

Minimum height $= 131 c m$
Maximum height $= 156 c m$
Range $= 156 - 131 = 25$
Number of classes $= 4$
Class range $= \frac{25}{4} = 6.25$ 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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The height of 20 students of a class (cm) are as given: 132,131,135,136,134,132,131,142,142,152,151,151,148,145,131,132,142,156,155,152. Arrange the data in the form of table of grouped data frequency distribution.

Minimum height =131cmMaximum height =156cmRange =156−131=25Number of classes =4Class range =254=6.25 approx 6class 1=131+6=137class 2=137+6=143class 3=143+6=149class 4=149+6155class 5=155+6=161Class interval Frequency131−137 9137−143 3143−149 2149−155 4155−161 2

The height of $20$ students of a class ( $c m$ ) are as given: $132, 131, 135, 136, 134, 132, 131, 142, 142, 152, 151, 151, 148, 145, 131, 132, 142, 156, 155, 152$ . Arrange the data in the form of table of grouped data frequency distribution.