Answer: 10 seconds
Explanation:
m here means mean.
Mean or more accurately arithmetic mean, is calculated by adding all the terms and then dividing by the number of terms.
If there are 5 terms being 4, 5, 5, 6 and a fifth one which is x, and the mean is 6. The relevant expression is:
(4 + 5 + 5 + 6 + x) / 5 = 6
Solving it:
4 + 5 + 5 + 6 + x = 6 * 5
20 + x = 30
x = 30 - 20
x = 10 seconds
C.Growth (learning about this too !!)
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D. because Facebook averages about 1.7 billion users everyday!
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