Two secretarial students, Agyemang and like are used Typewriter dealers. They found that the
length of time before a roser repor is required on
Typewriter sold is normally distributed with a mean
equal to 11 months and a Standard devotion & 2
monters. If the dealers wand only sto of the
Cars to fail before the end 나
guavarlee
period, for has many months should the Typewriters
be guaranteed
Wie
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