If the mean of the observations x, x + 3, x + 5, x + 7, x + 10 is 9, then the mean of the last three observations is :
A. 10\(\frac{1}{3}\)
B. 10\(\frac{2}{3}\)
C. 11\(\frac{1}{3}\)
D. 11\(\frac{2}{3}\)
Answer:C
If the mean of the observations x, x + 3, x + 5, x + 7, x + 10 is 9, then the mean of the last three observations is :
A. 10\(\frac{1}{3}\) B. 10\(\frac{2}{3}\) C. 11\(\frac{1}{3}\) D. 11\(\frac{2}{3}\)