In each case, sketch the two specified normal curves on the same set of axes:

a. A normal curve with μ = 20 and σ = 3, and a normal curve with μ = 20 and σ = 6.

b. A normal curve with μ = 20 and σ = 3, and a normal curve with μ = 30 and σ = 3.

c. A normal curve with μ = 100 and σ = 10, and a normal curve with μ = 200 and σ = 20.