Credit cards have 16 digit numbers, of which the first 15 digits identify the credit card and the sixteenth digit is the check digit (the last digit is fixed). u-kan-trust-us credit card numbers begin with 61, 62, or 63. what is the maximum number of credit cards that uktu can issue?

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?