Question:
The following is the distribution of weights (in kg) of 52 persons:
(i) What is the lower limit of class 50-60?
(ii) Find the class marks of the classes 40-50, 50-60.
(iii) What is the class size?
Solution:
(i) The lower limit of the class $50-60$ is 50 .
(ii) Class mark for the class $40-50$ :
$\frac{40+50}{2}$
$=\frac{90}{2}$
$=45$
Again, class mark for the class $50-60$ :
$\frac{50+60}{2}$
$=\frac{110}{2}$
$=55$
(iii) Here the class size is $40-30$, i.e. 10 .
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