Question: If two sections of a math class have standard deviations SD1 and SD2 respectfully, and there are n1 people in section 1 and n2 people

If two sections of a math class have standard deviations SD1 and SD2 respectfully, and there are n1 people in section 1 and n2 people in section 2, how do you calculate the standard deviation of the combined sections?

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