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Mathematics 15 Online
OpenStudy (anonymous):

susan keeps track of the number of tickets sold for each play presented at the community theater. within how many standard deviations of the mean do all the values fall? 135,71,69,80,158,152,161,96,122,118,87,85. I figured out the mean=111.166 and stand. deviat=32.83 but don't know the last part.

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