RRB NTPC Mains or Stage 2 Model Paper 5 with solutions

Question : 8 of 120

Marks: +1, -0

From a series of 50 observations, an observation with value 45 is dropped but the mean remains the same. What was the mean of 50 observations?

Solution:

∴{50x – 45}/49= x

⇒ 50x – 45 = 49x
∴ x = 45

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