PLS HELP ASAP!! THX For questions 9-11, refer to the graph below that shows three different normal distributions. This graph represents the attendance for three different classes (number of absences in a school year).
(Refer to attached photo)

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept

ok so what's the question?

step-by-step explanation:

b.

step-by-step explanation:

i just know

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)