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What is the probability that the player functions

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Reference no: EM131820470

The lifetime of a certain brand of battery is normally distributed with a mean value of 6 hours and a standard deviation of 0.8 hours when it is used in a particular DVD player. Suppose that two new batteries are independently selected and put into the player. The player ceases to function as soon as one of the batteries fails.

a. What is the probability that the player functions for at least 4 hours?

b. What is the probability that the DVD player works for at most 7 hours?

c. Find a number c* such that only 5% of all DVD players will function without battery replacement for more than c* hours.

Reference no: EM131820470

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