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Answer to Question #27825 in Statistics and Probability for mariam

Question #27825
Consumer Reports indicated that the average life of a refrigerator before replacement is mean=14 years with a (95% of data) range from 9 to 19 years. Assume the distribution is approximately normal. Find a good approximation for the standard deviation of this data set.

Find the probability P(z>0.8) using the standard normal distribution

two problems
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