find the probability that 25 randomly selected laptops will have a mean replacment time of 4.1 years or less. P(x-bar < 4.1 years) = Enter your answer as a number accurate to 4 decimal places. Based on the result above, does it appear that the computer store has been given laptops of lower than average quality? (Use the criteria that "unusual" events have a probability of less than 5%.)
The manager of a computer retails store is concerned that his suppliers have been giving him laptop computers with lower than average quality. His research shows that replacement times for the model laptop of concern are
Assuming that the laptop replacment times have a mean of 4.3 years and a standard deviation of 0.6 years, find the
P(x-bar < 4.1 years) =
Enter your answer as a number accurate to 4 decimal places.
Based on the result above, does it appear that the computer store has been given laptops of lower than average quality? (Use the criteria that "unusual"
- No. The probability of obtaining this data is high enough to have been a chance occurrence.
- Yes. The probability of this data is unlikely to have occurred by chance alone.
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