The class size of distribution is 25 and the first class-interval is 200 - 224. There are seven class-intervals.
Question:
The class size of 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.
Solution:
Given
Class size = 25
First class interval = 200 - 224
(i) Seven class interval are:
200 - 240, 225 - 249, 250 - 274, 275 - 299, 300 - 324, 325 - 349,3 50 - 374.
(ii) Class mark = 200 - 224
$=\frac{200+224}{2}$
= 424/2
= 212
Class mark = 225 - 249
$=\frac{225+249}{2}$
= 479/2
= 237
Class mark = 250 - 274
$=\frac{250+274}{2}$
= 524/2
= 287
Class mark = 300 - 324
$=\frac{300+324}{2}$
= 624/2
= 312
Class mark = 325 - 349
$=\frac{325+349}{2}$
= 674/2
= 337
Class mark = 350 - 374
$=\frac{350+374}{2}$
= 724/2
= 362