Answer:

answer is 6.4

Step-by-step explanation:

formula for harmonic mean is H=2ab/(a+b)

Answer: 6.4

Step-by-step explanation: The harmonic mean is given by

Harmonic mean =

Now we have two numbers 4 and 16

So, Harmonic mean is as follows:

Therefore, the harmonic mean of  4 and 16 is 6.4