Hi Abhinav,
One actually need not do all this calculation.
The reason I posted the explanation is because, understanding the concept of Standard Deviation will help us tackle all other questions on this topic.
GMAT tricks us by combining things such as - Standard Deviation and other concepts of statistics with Data Sufficiency.
In case you need further explanation, kindly let me know.
One actually need not do all this calculation.
The reason I posted the explanation is because, understanding the concept of Standard Deviation will help us tackle all other questions on this topic.
GMAT tricks us by combining things such as - Standard Deviation and other concepts of statistics with Data Sufficiency.
In case you need further explanation, kindly let me know.