Question

Find the resulting mean of the observations $8,12,16,22,10$ and $4$ if each of the observations given is increased by $25\%$.

• A. $10$
• B. $14$
• C. $12$
• D. $15$

Answer 1

Answer: (D)

$15$

The given observations are: $8,12,16,10,22,4$
Increasing each observation by $25\%$, we get: $10,15,20,12.5,27.5,5$
Mean $=\frac{\text{Sum}}{\text{Number of observations}}$
Mean $=\frac{10+15+20+12.5+27.5+5}{6}=\frac{90}{6}=15$