BECE Mathematics 2020 Paper

Concept:The median is the middle value of a data set when the numbers are arranged in ascending order.Explanation:First, arrange the given numbers in ascending order.The given numbers are $4,16,13,18,3,20,6,7,15,2,10,12$.After arranging: $2,3,4,6,7,10,12,13,15,16,18,20$.There are $12$ numbers, which is an even count.For an even number of observations, the median is the average of the two middle numbers.The two middle positions are the $6$th and $7$th numbers.The $6$th number is $10$ and the $7$th number is $12$.So the median is $\frac{10+12}{2} = \frac{22}{2} = 11$.Answer:The median is $11$, which is option C.