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The average life of an electric rice cooker is 5 years, with a standard deviation...

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The average life of an electric rice cooker is 5 years, with a standard deviation of 1 year. Assume the lives of these cookers follow a normal distribution. Find(a) The probability that the mean life of a random sample of 9 machines falls between 5.7 and 8.1 years. (Answer in percent with 2 decimal places. No need to include the percent symbol)(b) The value of to the left of which 85% of the means computed from random samples of size 9 would fall.(Answer in percent with 2 decimal places. No need to include the percent symbol)

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