In a frequency distribution, the mid value of a class is 15 and the class interval is 4. The lower limit of the class is
A. 10
B. 12
C. 13
D. 14
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We know that if 'a' is the mid value of a class and 'h' is the class size, then the lower and upper limits of the class are a - h/2 and a + h/2.
Given : In a frequency distribution, the mid value of a class is 15 and the class interval is 4.
Here , a = 15 and h = 4
The lower limit of the class is : a - h/2
= 15 - 4/2
= 15 - 2
= 13
Hence, The lower limit of the class is 13.
Option (C) 13 is correct.
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