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Weight of a bag of crisps follows a normal law. Should calculating the probability that one weighs < 140 g take care if bags are in samples?

You are correct that the sample has nothing to do with this question. The easy way to answer the question is to find a normal distribution calculator like this: https://keisan.casio.com/exec/system/...
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4 votes

Why do two different population sizes result in nearly equal sample sizes?

You learn two things from sampling from a population: You know the exact answer from the members of the population you sampled (which constrains what the overall population answer can be). You learn ...
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1 vote

Why do two different population sizes result in nearly equal sample sizes?

This is really just a comment, but I'll post it as an answer to be able to include the code and plot. One thing that might yield some insight would be to plot the Sam result from the function, across ...
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