1.

1). 122). 133). 154). 18

Answer»

As per given data -

Average of first 9 numbers in series is 19

SUM of 9 numbers = average × 9

⇒ Sum of 9 numbers = 19 × 9 = 171

& Average of 1st 4 numbers is 17

Sum of 1st 4 numbers = average × 4

Sum of 1st 4 numbers = 17 × 4 = 68

Also Average of LAST 4 numbers is 22

Sum of last 4 numbers = average × 4

Sum of last 4 numbers = 22 × 4 = 88

Sum of 9 numbers = sum of 1st 4 numbers + Middle number + sum of last 4 numbers

⇒ 171 = 68 + Middle number + 88

∴ Middle number = 15


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