A professional racing team is holding tryouts at its test track. The team requires its drivers to have an average lap time of at most 133 seconds at its test track. The team will use a one sample z-test of significance to determine if they should hire a new driver. An amateur driver completes 8 timed laps of the test track with an average lap time of 135 seconds. If the standard deviation of all lap times at this track is 4.8 seconds, what is the value of the test statistic?

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