A student asked me to explain this question from a previous year (high school) exam paper today. Fundamentally the question itself if very straight forward, however I thought it was quite poorly worded and perhaps open to misinterpretation. I'm wondering if anyone else thinks it a little ambiguous or if it's just me.(adsbygoogle = window.adsbygoogle || []).push({});

Heres the question.

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The manufacturerâ€™s specifications state that the life of their light globes is normally distributed with a standard deviation of 170 hours.

What is the mean life, in hours, of these light globes if 97.5% will last up to 5000 hours?

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The thing that I don't like about this question is that longevity specifications are usually in the form of "9x percent will lastat leasty hours, whereas here they seem to be saying that they will lastat mostthis many hours.

Does anyone else think that statement "if 97.5% will last up to 5000 hours" could have been better worded. I interpreted it as meaning that 97.5% will lastat most5000 hours but I'm wondering if anyone else here might have interpreted it the other way around?

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# Is this question ambiguously worded?

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