Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Facts about Standard Deviation: (1) Multiplying all the numbers change Standard Deviation (2) Adding and subtracting all the numbers with the same number keeps the standard deviation same. If you observe Set I and III are added versions of Set Q . Set I: 5 has been added to the Set Q Set III: Subtract each element from 80 and you would find a number there in the Set Q. Set II: elements are multiplied by 2 and standard deviation changes.
Hence the answer is C.
Re: Set Q consists of the following five numbers
25 Feb 2013, 21:36