Why use the word "normal distribution " in the question? Does it add any meaning?
The question can be solved without it.
Math experts ..please clarify
The word 'normal' could certainly be removed without changing the question in any way. The distribution doesn't need to have any special properties here.
Nov 2011: After years of development, I am now making my advanced Quant books and high-level problem sets available for sale. Contact me at ianstewartgmat at gmail.com for details.
Private GMAT Tutor based in Toronto