If the distribution of life spans in Exercise: 10.21 is

If the distribution of life spans in Exercise: 10.21 is

If the distribution of life spans in Exercise: 10.21 is approximately normal, how large a sample: is required in order that the probability of committing a type 11 error be 0.1 when the true mean is 35.9 months? Assume that a = 5.8 months.

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