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Can I have help figuring out if is it unusual?

Can I have help figuring out if is it unusual? a population is normally distibuted, with a mean of 100 and a stadard deviation of 15. I need help Determining whether either event is unusal. I need help explaining my reasoning. The mean of a sample of 20 is 105 or more.

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P(  ​ x ​ ¯ ​ ​  >... View the full answer

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=  P ( ​ X ​ ¯ ​ ​ ≥ 1 0 5 )  =... View the full answer

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