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If have mean of 250 hours and a standard deviation of 20 hours. How i can find the What percentage of battery packs lasts longer than 260 hours?

If have mean of 250
hours and a standard deviation of 20 hours.
How i can find the What percentage of battery packs lasts longer than 260 hours?

If a simple random sample of four battery packs is selected from your company and we
assume that their life spans are independent, what is the probability that they all last
longer than 260 hours?

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