Is the standard deviation of numbers w,x,y and z greater than 2?
1) w=3
2) The average of the four numbers is 8
1) w=3
2) The average of the four numbers is 8
Pick C
St 1 : Doesn't give enuf info abt rest of 3 numbers. Insufficient
St 2:
Case 1: 8,8,8,8
SD = 0
case 2 : {-1,17,8,8}
SD is greater than 2.
Inconsistent . Insufficient
Combining st 1 & st 2 :
{3, X,Y, Z}
Case 1 ( Best case scenario) : 3, 13,8, 8 ---- as we need to maintain average of 8
SD = sqrt(12.5) which is certainly greater than 2.
So pick C
