The class mark of the class 130−150 is
(a) 130
(b) 135
(c) 140
(d) 145

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Solution

(c) 140

$Class mark = \frac{Lower limit + Upper limit}{2} = \frac{130 + 150}{2} = 140$

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120 - 130

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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