This can help the student to understand the problem and How to find mean and standard deviation given percentages.
3 Answers. Sorted by: 3. Let the weight of the chickens be X. Then X ∼ N ( μ, σ 2) where σ = 4.2 is the standard deviation of the weights and μ is the mean of the weights. Then, the statement
Standard Deviation = sqrt(250*0.04*0.96) So about 3 in your case. Hope this helped!
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