RRB Group D Model Paper 5 with solutions

Question : 72 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

Go to Question:

Prev Question

Next Question