Maths-
SAT
Easy
Question
An analysis of a random sample of a type of laptop. computer battery estimated that the mean working time was 4.7 hours with a margin of error of 0. 7 hours. Which of the following is the most appropriate conclusion based on this analysis?
- This type of laptop computer battery has a mean · working time of at least 4.7 hours.
- This type of laptop computer battery has a mean working time of at least 5.7 hours.
- This type of laptop computer battery has a mean, working .time of between 4.0 and 5.4 hours.
- This type of laptop computer battery has a mean working time of between 0.0 and 0.7 hours.
The correct answer is: This type of laptop computer battery has a mean, working .time of between 4.0 and 5.4 hours.
The mean working time was 4.7 hours
The margin of error of 0.7 hours
4.7 – 0.7 to 4.7 + 0.7
4.0 hours to 5.4 hours.
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