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Answer to Question #73738 in Statistics and Probability for Shinimi
Question #73738
The average life of a small motor is 10 years with a standard deviation of 2 years. The manufacturer replaces free all motors that fail while under guarantee. If the manufacturer is willing to replace only 3% of the motors that fail, how long a guarantee should he offer? Assume lifetimes are normally distributed.
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Dear rockimendo, please use the panel for submitting new questions.
A random sample of eight cigarettes of a certain brand has average nicotine content of 4.2 milligrams and standard deviation of 1.4 milligrams. Is this in line with the manufacturer claim that the average nicotine content does not exceed 3.5 milligrams? Use 0.01 level of significance.
A sample survey on the average total monthly expenditure includes 150 students of a certain university. The mean total expenditure per student per month for the sample was P 5, 300. 00 with a standard deviation of P 500. 00. How likely is it that the students spend an average of P 6, 200.00 per year as claimed by the parents at 0.01 level of significance?
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