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Hello

Because common standards have a fixed meaning, they readily reveal group stereotypes.

--- Does that sentence mean that common standards reveal group stereotypes because they have a fixed meaning?
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Newguest, I have NO idea what this passage means.

Your interpretation is what the sentence says, but what it exactly means to say "common standards have a fixed meaning" is anyone's guess. Maybe it made more sense in context.
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Hi

Here's more context: Even when men and women receive comparable evaluations of their competence, those evaluations can have different meanings on a so called common standard that forces people to use the same judgment standard for both sexes. Because common standards have a fixed meaning, they readily reveal group stereotypes.

--- Is it clearer now?
Not really. Unless you're talking about being evaluated on the abilty to lift weights or how tall you are, I don't konw what sort of evaluations should NOT use the same jdugement standard for both sexes.

To the contrary, I'd say having standards that vary by sex would be more likely to show stereotypes than having a common stanard, fixed for both sexes!