Question: Hi please could you help me with this question: A smartphone, Kaphone, has its battery's lifetime, Y hours, modelled by a normal distribution with mean

Hi please could you help me with this question:

A smartphone, Kaphone, has its battery's lifetime, Y hours, modelled by a normal distribution with mean 7 hours and standard deviation s. 25% of randomly selected Kaphone batteries last less than 5 hours. Find the value of s, correct to three significant figures.

Thank you

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