Mathematics, 28.04.2021 16:30 chandlern

Twenty-five heat lamps are connected in a greenhouse so that when one lamp fails, another takes over immediately. (Only one lamp is turned on at any time.) The lamps operate independently, and each has a mean life of 80 hours and standard deviation of 5 hours. If the greenhouse is not checked for 2,075 hours after the lamp system is turned on, what is the probability that a lamp will be burning at the end of the 2075-hour period

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