Page 36 - Pharmaceutical Analytical Chemistry III

Measures of Central Tendency–Arithmetic Mean

-Sort data by value. Example: Results from five replicate determinations of iron in
-Median is the central aqueous
value of this series.
samples of a standard solution containing 20.0 ppm iron(III).

Calculate the mean and the median for the following
data: 19.4, 20.3, 20.1, 19.8 and 19.6.

Answer:
Mean = (19.4 + 20.3 + 20.1 + 19.8 + 19.6)/5= 19.84
Sort data (19.4, 19.6, 19.8, 20.1, 20.3)
Median is 19.8