Eight lamps run on batteries whose average life is 2 months. With new batteries, they were simultaneously switched on September 25, 2021. What is the probability that 5 are still lighted on Christmas day 2021?

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A:

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Q: D. C. d. e. X= 7.8, s=5.1, n = 10 μ = 5.3, X= 5, s = 0.14, n = 8 μ = 9.1, X= 7.2, s = 1.8, n = 15…

A: According to guidelines we solve only first question when given questions are different.

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A: According to guidelines we solve first three subparts when given multiple subparts.

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A: