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I would like some detailed explanation for the following statistical methods exercise A company that produces power banks claims that the average time it takes

I would like some detailed explanation for the following statistical methods exercise

A company that produces power banks claims that the average time it takes to charge a cellphone

to full power is 120 minutes with a standard deviation of 3 minutes. A consumer advocacy group

randomly selects 6 power banks made by this company and charges 6 identical cellphones to full

power.

Question 1

What is the probability that the standard deviation of time it takes to charge a

cellphone to full power is less than three times the standard deviation claimed by the

company?

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