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Average age of particular types of dogs is 14.7 years with a standard deviation being 1.2 years. It is thought that the mean has changed

Average age of particular types of dogs is 14.7 years with a standard deviation being 1.2 years. It is thought that the mean has changed but the standard deviation has remained the same. How many dogs should be surveyed to be able to estimate the new meanby the sample meanwith maximum error of estimate 0.1 years and a 90% level of confidence?

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