The class scores of a history test have a normal distribution with a mean mc010-1.jpg = 79 and a standard deviation mc010-2.jpg = 7. if opal’s test score was 72, which expression would she write to find the z-score of her test score?

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

go and ask your mom to you