Answer :

To find: The mode of the marks obtained in science

Mode = l +
Where l = lower limit of the modal class
          h = width of the modal class
          f1 = frequency of the class preceding modal class
          f2 = frequency of the class following modal class

Here, the maximum frequency is 20, the corresponding class interval 50-60 is modal class

l=50, h=10, f=20, f1=13, f2 =5

Mode = l +

Mode = 50 +

Mode =50+ =50 + 3.18

Mode =53.18

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