In a frequency distribution, the mid-value of a class is 20 and the width of the class is 8.then what is the lower limit ?
Mid value (a) = 20
Width (h) = 8
Lower limit = a - h/2
= 20 - 8/2
= 20 - 4
= 16
Upper limit = a + h/2
= 20 + 8/2
= 20 + 4
= 24
Thus, the class limit = 16 - 24.
Also, a - h/2 and a + h/2 is the formula for finding out the lower and upper limit when class mark i.e mid value and class interval or width is given where a = mid value and h = width..
Hope u get it !!
:) :)