For any set of data, at least of the data will be within two standard deviations of the mean. For a bell-shaped distribution, approximately of the data will be within two standard deviations of the mean

Some of the first computer games were created in the early 1970s by college students experimenting after hours to see what the were capable of doing.

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1. for which of the following are you not required to signal beforehand? a. changing lanes b. speeding up c. stopping