M=3 (5,15) pleas help .

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Which statement about the annual percentage rate (apr) is not true?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.