Can someone please help explain how to do number 14?  Thanks!

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A coffee machine is considered reliable if the range of amounts of coffee it dispenses is less than 2 fl.oz. In 8 tries a particular machine dispenses the amounts lying in the set {7.1, 6.8, 7.6, 7.1, 7.4, 6.8, 7, 6.7}

The range of the amounts dispensed is equal to the difference between the largest and smallest amounts dispensed.

This is 7.6 - 6.7 = 0.9 fl. oz.

As 0.9 fl. oz. is less than 2 fl. oz. the machine can be called a reliable one.

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