Solve.From a series of measurements, the mean voltage in a certain line is found to be 26,420 V with a standard deviation of 210 V. A breaker must be installed to protect against surges in voltage. If the breaker is set so that it is activated only about 0.1% of the time, at what level is it set?
A. 26,630 V
B. 27,260 V
C. 26,840V
D. 27,050 V
Answer: D
Mathematics
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