A certain list of 100 data has an average (arithmetic mean) of 6 and a standard deviation of d, where d is positive. Which of the pairs, when added to the list, must result in a list of 102 data with standard diviation of less than d
a) -6 and 0
b) 0 and 0
c) 0 and 6
d) 0 and 12
e) 6 and 6
Can someone crack this for me. It was my first GMAT question and it through me off-guard that the rest of my exam was spoilt!
a) -6 and 0
b) 0 and 0
c) 0 and 6
d) 0 and 12
e) 6 and 6
Can someone crack this for me. It was my first GMAT question and it through me off-guard that the rest of my exam was spoilt!
