RRB NTPC Prelims Model Paper 4 with solutions

Question : 59 of 100

Marks: +1, -0

Mean of 10 numbers is 30. Later on it was observed that numbers 15, 23 are wrongly taken as 51, 32. The correct mean is

Solution:

(1) Actual sum = 30 × 10 + 15 + 23– 51 – 32 = 300 – 45 = 255.
So the actual sum is 300 – 45= 255.
So the correct average is,

255/10=25.5

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