If you fail, never give up because FAIL means 'First Attempt In Learning'.— A. P. J. Abdul Kalam

Statistics — quick quiz

5 real MPESB Group questions on Statistics. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.

Question 1 of 5

HARD

The mean of 20 observations is 45. Later it was found that two observations were wrongly recorded as 30 and 40 instead of 50 and 60. What is the correct mean?