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7) A manufacture of plasma televisions has determined that the television require servicing after a mean of 67 months, with a standard deviation of
7) A manufacture of plasma televisions has determined that the television require servicing after a mean of 67 months, with a standard deviation of 7.2 months. What length of warranty should be offered, if the manufacturer wants to repair less than 3% of the televisions under the warranty? (3 marks)
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