The mean of 30 observations recorded in an experiment is 5. lf the observed largest
MATHEMATICS
WAEC 1991
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
Correct Answer: B. 4
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
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