If the lower and the upper limits of a class interval are 7.5 and 12.5, the class-mark is :
10
2.5
7.5
12.5
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If the upper and the lower limits of a class interval are 16 and 10, the class-mark is :
6
3
13
none of these
In a pie-chart, 76 articles are represented by 19°; how many articles will be represented by 76° ?
19
76
304