The height in centimetres of $30$ students of class $6$ in a school are given below: $138, 130, 132, 138, 140, 138, 140, 152, 132, 140, 155, 140, 132, 138, 140, 150, 138, 140, 150, 155, 150, 152, 155, 140, 138, 132, 155, 138, 140, 132$ If $150 c m$ is the standard height of the students of the class, how many are below this?

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Solution

Height less than $150 c m$ are as follows: $138, 130, 132, 138, 140, 138, 140, 132, 140, 140, 132, 138, 140, 138, 140, 140, 138, 132, 138, 140, 132$
Hence, there are 21 students with heights less than $150 c m$ .

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The height in centimetres of $30$ students of class $6$ in a school are given below: $138, 130, 132, 138, 140, 138, 140, 152, 132, 140, 155, 140, 132, 138, 140, 150, 138, 140, 150, 155, 150, 152, 155, 140, 138, 132, 155, 138, 140, 132$ What is the range?

The table below shows the number of students in class 10 of a school, classified according to their heights:

Height

(cm)

Number of Students

120 − 125

125 − 130

130 − 135

135 − 140

140 − 145

145 − 150

150 − 155

155 − 160

Calculate the mean height

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The height in centimetres of 30 students of class 6 in a school are given below:138,130,132,138,140,138,140,152,132,140,155,140,132,138,140,150,138,140,150,155,150,152,155,140,138,132,155,138,140,132If 150cm is the standard height of the students of the class, how many are below this?

Height less than 150cm are as follows:138,130,132,138,140,138,140,132,140,140,132,138,140,138,140,140,138,132,138,140,132Hence, there are 21 students with heights less than 150cm.

Height less than $150 c m$ are as follows: $138, 130, 132, 138, 140, 138, 140, 132, 140, 140, 132, 138, 140, 138, 140, 140, 138, 132, 138, 140, 132$
Hence, there are 21 students with heights less than $150 c m$ .