When a data set has an even number of elements, the median is calculated by

Example:
Set of data: 1,2,3,4,5,6,7,8
Cross of 1 and 8, cross off 2 and 7, cross off 3 and 6. Two numbers are left so find the average by adding the two numbers and dividing by 2.
i.e. 4+5=9 and 9/2= 4.5
The median would be 4.5.
In other words the median is halfway between the two numbers.

Engineers have contribute to society in many ways like making the technology we use today or any type of power energy material