Danielle wants to estimate the average auto insurance of her colleagues.She sent out a survey to a randomly selected 30 colleagues through email, and 12 of them responded. Their paid premium is listed below.

448

450

564

558

426

490

514

427

436

389

429

449

To ease your calculation, part of the worksheet is provided. Please complete the worksheet to findxiand(xix)2

first.

(1) (2pts) What is the POPULATION of the study? What is the SAMPLE of the study?

(2) (2pts) Find the sample mean and sample standard deviation of the 12 responded colleagues.(No points will be given without steps)

(3) (4pts) With information provided, please help Danielle to estimate the average premium of ALL HER COLLEAGUES.(No points will be given without steps)