Mathematics, 03.03.2020 00:49 Sanshine

The lifetime of a certain resistor in a certain application has a mean of 900 hours and a standard deviation of 30 hours. Four resistors are used in sequence (i. e., one after the other), and the total length of time that the four resistors last is recorded. The resistors are independent of one another. What is the mean length of time in hours that the four resistors last?

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