7.3B 4. Mrs. Hotchkiss has $21.70 in her bank account. She
writes a check to buy three books that are $12.99 each.
Her bank charges $20 in overdraft fees for insufficient
funds. What is Mrs. Hotchkiss' new balance?

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?