[For questions 8, 9, and 10] - The old Nokia 3310 battery lasts 31 hours on standby. Nokia produces a new Nokia that is advertised to last longer than the Nokia 3310. This was tested by charging the new Nokia and letting it die 80 times - the average time for the battery to die was 33.5 hours, with a standard deviation of 4 hours. How confident can we be that this new phone lasts longer than the Nokia 3310? 99% O >99% 97.5% 95%

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