Question: b. Use the normalcdf function on a calculator to nd the probability that the battery life is 20 hours or longer for each phone. (2

b. Use the normalcdf function on a calculator to nd the probability that the battery life is 20 hours or longer for each phone. (2 points) c. Based on your answer to part b, do you think the data sample of 20 hours for ChatLong is reasonable? Or do you think the company data is wrong? (1 point)

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