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PLEASE HELP ME!!!

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?

Respuesta :

1. The answer would be 720 minutes
2. The reason that the new test would be greater then 6 minutes is because they are new test batteries and have not been used or ran.

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