A drive-through fast-food chain obtained the following pick-up times (number of minutes between the time an order is placed and the time the order is picked up at the drive-through window). A random sample of 30 orders along with the corresponding duration is given in the following table:

a. What is the approximate mean pick-up time?
b. What is the approximate variance and standard deviation?

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Number of Minutes, x, 2 < 4 4 < 6 68 8 10 Number of Orders, fi 11 8 6 LO 5