Question

The mean of 15 observations is 30. Two observation is 28 and 38 are deleted and three observations 33, 39 and 48 are induced. Find the mean of new set of observations.

A
Mean of new set is less than 33.

B
35

C
31.5

D
Mean of new set is greater than 33

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Answer 1

Answer:

D

Step-by-step explanation:

Sum of the 15 observations =30×15=450

Two observations 28 and 38 are deleted

then sum of the remaining 13 observations =450−[28+38]= 384

Three observations are included 33+39+48+384=504

Therefore req. mean = 504/ 13

= 38.7