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Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 103.3 hours and a

Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 103.3 hours and a standard deviation of 13.9 hours. The best 77% of batteries wouldlast beyond how many hours? Answer correct to 2 decimal places.

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