Test scores @ level 2 are distributed with a mean of 500 , sd = 100 .
All random sample of 100 test scores , sd of sample means ?
Probability of 100 randomly selected test scores will have a mean test score that is 490-520 ?
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Test scores @ level 2 are distributed with a mean of 500 , sd = 100 .
All random sample of 100 test scores , sd of sample means ?
Probability of 100 randomly selected test scores will have a mean test score that is 490-520 ?

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