Question

if there are two groups with 75 and 65 as harmonic means containing 15a and 13 observation then the combined hm is given by​

Answer 1

Answer:

70.36

Step-by-step explanation:

The group with an average of 75 harmonic means had 15 observations.

The group with an average of 65 harmonic means had 13 observations.

The answer given is 70.36

the quick way is to test my hypothesis and see if it comes up with the right answer.

(75 * 15 + 65 * 13) / (15 + 13) = (1125 + 845) / (28) = (1970) / (28) = 70.35714286 which rounds off to 70.36

my hypothesis was correct.

you are taking a weighted average.

that's your answer.

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