Can you help me please thank you

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

Paul’s car is 18 feet long. he is making a model of his car that is 1/6 the actual size. what is the length of the model?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =