Has anybody done this worksheet and could tell me what it says?

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

What does the relationship between the mean and median reveal about the shape of the data

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =