Question

41. If mean of ten consecutive odd numbers is 120
then the mean of first five odd numbers among
them is
(a) 113
(b) 115
(c) 114
(d) 116
​

Answer 1

Answer:

If mean of those 10 odd numbers is 120, then, their sum is 120 × 10 = 1200

Let smallest of them be x.

THEN OTHERS ARE:-

x + 2

x + 4

x + 6

x + 8

x + 10

x + 12

x + 14

x + 16

x + 18

SO,

x + x + 2 + x + 4 + x + 6 + x + 8 + x + 10 + x + 12 + x + 14 + x + 16 + x + 18 = 1200

=> 10x + 90 = 1200

=> 10x = 1110

=> x = 111

So, first 5 no.s are,

111, 113, 115, 117, 119

Mean = (111 + 113 + 115 + 117 + 119) ÷ 5 = 115

therefore option b.

HOPE IT HELPS

PLS MARK IT AS BRAINLIEST