Find mean for
CI 15-25 25-35 35-45 45-55 55-65 65-75 75-85
F 6 11 7 4 4 2 1
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The class 35-45 has maximum frequency. Therefore, this is the modal class.
l=35,h=‘10,f=23,f1=21,f2=14
Therefore,
Mode = l+2f−f1−f2f−f1×h
=35+46−21−1423−21×10
=35+112×10
=35+1120=36.81
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