If mike can type 120 words per minute, how long would it take him to type 420 words?

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

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

X+ y = 5 ; x - y =3 solve using linear combination