question 8 suppose that the duration of trouble free operation of a ne
Suppose that the duration of trouble-free operation of a new vacuum cleaner is normally distributed with a mean of 72 weeks
and variance of 144 weeks2. The research department randomly selects 25 customers who bought these vacuum cleaners and
records duration (in weeks) of trouble-free operation.
The standard error of the sample mean is
weeks (1 decimal place).
The probability that the average duration of trouble-free operation time is between 75 weeks and 78 weeks is
(4 decimal places).
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