The class size of a distribution is 25 and the first class- interval is 200- 224. There are seven class - intervals.
(i) Write the class - intervals.
(ii) Write the class - marks of each interval.

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Solution

Class size = 25
First class is 200 - 224
$∴$ Number of class = 7
$∴$ Class interval will be

$(i) 200 - 224, 225 - 249, 250 - 274, 275 - 299, 300 - 324, 325 - 349, 350 - 374 (i i) C l a s s m a r k s o f 200 - 224 = \frac{200 + 224}{2} = \frac{424}{2} = 212 C l a s s m a r k o f 225 - 249 = \frac{225 + 249}{2} = \frac{474}{2} = 237 C l a s s m a r k o f 250 - 274 = \frac{250 + 274}{2} = \frac{524}{2} = 262 C l a s s m a r k o f 275 - 299 - \frac{275 + 299}{2} = \frac{574}{2} = 287 C l a s s m a r k o f 300 - 324 = \frac{300 + 324}{2} = \frac{624}{2} = 312 C l a s s m a r k o f 325 - 349 = \frac{325 + 349}{2} = \frac{674}{2} = 337 a n d c l a s s m a r k o f 350 - 374 = \frac{350 + 374}{2} = \frac{724}{2} = 362$

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