The life of a cellphone battery has a lognormal distribution with μ = 4.5 and o= 0.4 (the mean and standard deviation of Inx). What proportion of battery lifetime values are at least 125 hours?

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A: DETAILED SOLUTION IS PROVIDED BELOWExplanation:

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Q: 90 85 75 76 81 76 75 76 76 96 89 88 73 81 93 76 76 96 89 88 73 81 89 74 74 74 76 86 75 96 79 73 86…

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