Discussion
Which one of the following is commonly used for computing the average value of river discharge ?
Answer: B
The key marks the geometric mean as the one commonly used to compute the average value of river discharge.
River discharge varies over a wide range and its distribution is skewed, so a few very high flows would inflate the arithmetic mean. The geometric mean damps the effect of extreme values and is used for such data. The harmonic mean is for rates and ratios, and a weighted mean is used when the observations have unequal importance. The arithmetic mean is the commonest average but the key does not give it here.
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