the following data is arranged in ascending order
9,10,12,13,7x,7x+1,17,19,21
if the median of the data is 14.5, what is the value of x
total no of observations are 9 so n+1/2 observation is the median
so 9+1/2=10/2 = 5
th observation is 7x is median.
so 7x = 14.5, x = 14.5/7