What is the mean of 12 , 27 and 147 ?

Answer:

8) B

/12 = √√2 x 2 x 3 = 2√3
√27 = 3x3x3 = 3√3
147 = √7x7x3 = 7√3
For mean, we add these up and divide by 3 2√3 + 3√3 +7√3 = 12√3
Divide by 3, we get:
12√3
3
= 4√√3
4√3
= √4x4x3 = 48