Uh... I uh don’t remember studying this and need help

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

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?