Question

A data set has 20 elements. A second data set of 20ciements is obtained by adding 7 to each element of thefirst set. A third data set of 20 elements is obtained bymultiplying each element of the second data set by 3.The median of the third data set is 63. What is the medi-an of the first data set?A.7B.14C.21D.196E.210

Answer 1

The first step to answer this question is to divide the median by 3.

$\frac{63}{3}=21$

Now, substract 7 from the result:

$21-7=14$

The answer is B. 14.