A box of LED light bulbs was tested to see how long the light bulbs last. The standard deviation of the light bulb lifetime data was five years. Which of the following is the best interpretation of this value?

Standard deviation describes how far data values typically lie from their mean. A standard deviation of five years means bulb lifetimes typically vary by about five years from the average lifetime. It does not describe the overall range, the median, or the middle half of the data.

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