I need help asap
I will need help finding a and b

(a)

(b)

Step-by-step explanation:

Given

Tables (a) and (b)

Required

Determine the standard deviation

For (a):

--- mean

The standard deviation is calculated as:

This gives:

For (b):

--- mean

The standard deviation is calculated as:

This gives:

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