1.

Find x and y from the following cumulative frequency

Answer»

\(\because\) 15 + x = 28

(\(\because\) 28 is cumulative frequency of class 8 - 16 which is obtained by adding frequencies of this class and all previous classes which is equal to 15 + x)

⇒ x = 28 - 15 = 13

Also, 43 + 18  = y

⇒ y = 61



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