Find the value of 10 + 20 + 30 + 40 + 50 + 60.
210

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Solution

The correct option is A 210
Find: 10 + 20 + 30 + 40 + 50 + 60

First term = 10, second term = 20, third term = 30, fourth term = 40, fifth term = 50, sixth term = 60

Sum of first and sixth terms = 10 + 60 = 70

Sum of second and fifth terms = 20 + 50 = 70

Sum of third and fourth terms = 30 + 40 = 70

So, 10 + 20 + 30 + 40 + 50 + 60 = 70 $\times$ 3

10 + 20 + 30 + 40 + 50 + 60 = 210

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X	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
F	$20$	$10$	$10$	$10$	$40$	$30$

1^{0} \times 2^{0} + 3^{0} \times 4^{0} + 5^{0} \times 6^{0}

Identify the modal class:

80, 10, 30, 70, 60, 50, 50, 40, 40, 20, 40, 90, 50, 30, 70, 10, 60, 50, 20, 70, 70, 30, 80, 40, 20, 80, 90,

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x

y

Class-interval	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	Total
Frequency	$5$	$x$	$20$	$15$	$y$	$5$	$60$

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