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OpenStudy (anonymous):

In California the air pollution index averages 20.6 during the year with a standard deviation of 12. Assuming normality, the index falls within what interval 85% of the time? Can someone explain this problem, like break it down? I changed the words and numbers from my homework so I am not cheating or anything. I just dont understand what I'm supposed to do. I will give A MEDAL!

OpenStudy (anonymous):

Thanks for your help!

OpenStudy (anonymous):

SOMEONE HELP ME PLZ!

OpenStudy (anonymous):

I am sooooo confuzed!

OpenStudy (anonymous):

Thanks for viewing

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