I have a problem to find sample standard deviation when only the mean and mean of their square are given. Mean = 19.19 and mean of their square is 618.10
How to calculate sd when there is no N value given here?
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1Welcome to MSE! What have you tried so far? Where are you stuck? https://math.meta.stackexchange.com/questions/9959/how-to-ask-a-good-question – Dzoooks Nov 08 '18 at 04:11
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@Dzoooks That's what the question is about? I have no clue from where should I start? – Jos Butler Nov 08 '18 at 04:23