Coefficient of variation is the ratio of the standard deviation to the mean (average)
Coefficient of variation = (standard deviation/mean) × 100

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It depends on the quality of the balls. It also depends on where you are buying them. Do you have any more details?
Pretty sure the answer is 77
It is a cap-size parabola. The parabola "goes down". The graph of this function looks like in this attached picture.
Answer:
I'm not sure but I believe the correct answer is line L2.
Step-by-step explanation:
It seems to be closer to more points than the other lines.
If it is not L2, it must be L3.