1. The weights of fish in a certain lake are normally distributed with a mean of 12 pounds and a population standard deviation of 4.2 pounds. If 64 fish are randomly selected from this lake, what is the probability that their mean weight will be at least 13 pounds?

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A: 5) Given Information: Mean μ=4300 Standard deviation σ=750

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A: Mean = 50 Standard deviation = 10 Sample size, n = 25

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A: The variance of X is calculated as V(X) = E(X2) - (E(X))2 And SD(X) = √(V(X))

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A: Given information: Mean=50 hours and standard deviation=15 hours. That is, μ=50 and σ=15

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