Mathematics, 09.10.2019 15:30, Dekyraaa

What does a plus over a minus sign mean? i'm a science student and am doing some data analysis for one of my reports. am not great on maths and don't know what a plus sign with a minus sign under it means. can anyone ? (am doing mean volume and standard deviation calculations - don't know if it makes a difference)

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What does a plus over a minus sign mean? i'm a science student and am doing some data analysis for...