The mean of 30 observations recorded in an experiment is 5. lf the observed largest value of 34 is deleted, find the mean of the remaining observations
-
A.
5 -
B.
4 -
C.
3.9 -
D.
3.4 -
E.
3.0
Correct Answer: Option B
Explanation
x = 5, (frac{sum {fx}}{sum {f}}) =
5= (frac{sum {fx}}{30})
(sum {fx}) = 5 x 30 = 150; 150 – 34 = 116
(sum {f}) = 29
(sum {fx}) = 116
= (frac{116}{29}) = 4