JEE-Mains 2015 (26/30)
Probability
Level
2
The mean of the data set comprising of 16 observations is 16. If one of the observation valued 16 is deleted and three new observations valued 3, 4 and 5 are added to the date, then the mean of the resultant data, is :
15.8
14.0
16.0
16.8
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1 solution
M e a n = n ∑ x 1 6 ∑ x = 1 6 Therefore, 1 6 − 1 + 3 ∑ x − 1 6 + 3 + 4 + 5 = 1 4