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    Melosa1234's Avatar
    Melosa1234 Posts: 5, Reputation: 1
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    #1

    Mar 19, 2014, 07:10 AM
    The factory machine cuts wire
    Afactorymachinecutsmetalwireintostrips.Thelengthof thestripsisknown tofollowanormaldistributionwithmeanof22cmandstanda rddeviationofσ. Thestripsarepackagedandsoldingroupsof12.Thecompany claimsthat90%of thesestripsarepackagedwithanaveragelengthwithin21c mand23cm.Whatis thevalueofσ?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 19, 2014, 07:31 AM
    Use the Z-score table in your text book or available on line to determine the value of z that corresponds to an area under the normal probability curve of 90%, i.e the area is 0.45 to the left of the mean and 0.45 to the right. Then you can calculate sigma from
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