Can some one help me please!

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

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)