Find the value of the given variable (-4, r) (-8, 3) m=5

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?

This is different from the first one can someone me

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8