How do you find the upper quartile?

To find the upper quartile (Q3) of a data set, first, arrange the data in ascending order. Then, determine the position of Q3 using the formula ( Q3 = \frac{3(n + 1)}{4} ), where ( n ) is the number of data points. If the result is a whole number, Q3 is the value at that position; if it's a decimal, round up to the next whole number and find the average of the values at the two closest whole number positions.