RRB NTPC Mains or Stage 2 Model Paper 3 with solutions

Question : 26 of 120

Marks: +1, -0

If the average of 39, 48, 51, 63, 75, 83, x and 69 is 60, then the value of x is

Solution:

Average = 60

={39 +48 +51 +63 +75 +83 +x+69}/8

428 + x = 480

x = 52

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