The graph in the figure shows the position of an object as a function of time. The letters H-L represent particular moments of time. At which moments shown (H, I, etc.) is the speed of the object
(a) the greatest?
(b) the smallest? 
Definitions:
Random Cause Variation
Variability in data or processes that is caused by numerous uncontrollable factors, observed in a natural, random spread of results.
Centerline
In the context of statistical process control charts, this is the median line around which the plotted values are expected to vary.
Random Variation
The natural fluctuation in data or process outcomes, occurring without a specific, predictable cause.
Sample Proportion
The ratio of the number of times an event occurs to the total number of observations or trials in the sample.
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