approximately Normal. A 95% confidence interval for the mean time u the population of postal service employees have spent with the postal service is

In a random sample of 6 cell phones, the mean full retail price was $547.30 and the standard deviation was $176.00. Further research suggests that the population mean is $428.25. Does the t-value for the original sample fall between and to.95? Assume that the population of full retail prices for cell phones is normally distributed. - to.95 The t-value of t = fall between -1 -to.95 and to. .95 because to 95 = (Round to two decimal places as needed.)

% of all data lies within one standard deviation to the left of mean  % of all data lies with two standard deviation to the right of mean

The incomes of math tutors in a tutoring center of a university are normally distributed with a mean of $1100 and a standard deviation of $150 what percentage of tutors earn less than $900 a month