Here is a list of eight integers
11 19 15 3 13 7 22 x
The value of x is three times the median of these eight integers.
(a) Find the median
(b) Work out the numerical value of the mean of the eight integers.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.