Mathematics, 23.10.2020 02:01 1deanxcas1

On average, a laptop battery lasts 120 minutes with a standard deviation of 4 minutes. 6 batteries are randomly selected for a quality control test.

1. Calculate the chi square statistic for the test if the standard deviation of the selected batteries is 6 minutes.

2. If the test is repeated with a new random sample of 6 batteries. What is the probability that the standard deviation of the new test is greater than 6 minutes?

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