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OpenStudy (anonymous):
the mean life of a wristwatch is 25 months,with a s.d of 5 months. If the distribution is normal for how many months should a guarantee be made if the manufacturer does not want to exchange more 10% of the watches? assume the variable is normally distributed
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OpenStudy (anonymous):
10% = 0.1 on the table what is z
OpenStudy (anonymous):
|dw:1348839622831:dw| |dw:1348840079773:dw| sub z and solve for x
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