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A truck gets 600/x mpg when driven at a constant speed of x mph (between 40 and 80 mph) . If the price of fuel is $1/gallon and the driver is paid $8/hour, at what speed between 40 and 80 mph is it most economical to drive?
Mean
To determine the arithmetic average, one sums up every number in the collection and divides by the number of elements in the collection.
Standard Deviation
An indicator that measures how much a set of data points spread out or diverge.
Z-Score
An index that quantifies how far a particular value stands from the dataset's mean, measured in units of standard deviations away from the mean.
Z-Scores
A measure that represents the number of standard deviations a data point is from the mean of the dataset.
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