Divide 3 from both sides to get a=57/3 then a=19
Step-by-step explanation:
By pressing the button that looks like this
We know that
Mean and median both try to measure the central tendency in a data set.The mean is commonly used, but sometimes the median is preferred.
Mode is the element which occurs the most times in the set
therefore
the answer is the option
Both the mean and median are appropriate measures of center.