Insert 6 arithmetic means between 4 and b ,so that 5th mean may be 14. also b

Classify the following triangle check all that apply

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

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much