Standard deviation estimation

[brazen wave]

This is probably a stupid question but I spent a while doing the first question because I didn't know how to estimate standard deviation, I've looked everywhere how to, but nowhere says, so if someone could tell me I'd be grateful.

[pine sapphire]

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[queen bane]

Find the grouped mean, then the grouped variance. And square root it.
Recall that for grouped statistics you need to use interval midpoints.

[brazen wave]

Alr thanks

+close

[stoic blaze]

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[stoic blaze]

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