Pls can someone help me will give brainliest. 7th grade math

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?

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?