1.a.

for z = 1.7, A = .455

1.b.

z = 1.7, then A = .455

1.b. for z = -.5, A = .192

for z = 1.5, A = .433

So .192 + .433 = .625

1.c.

z = 2.1, so A = .482

Answer = .500 + .482 = .982

1.d.

z = 1.5, so A = .433

Answer = .500 - .433 = .067

2.a.

z = (64-70)/6 = -6/6 = -1, so A = .341

Answer = .500 - .341 = .159

2.b.

z = (61-70)/6 = -9/6 = -1.5, so A = .433

z = (76-70)/6 = 6/6 = 1, so A = .341

Answer = .433 + .341 = .774

2.c.

z = (79-70)/6 = 9/6 = 1.5, so A = .433

Answer = .500 - .433 = .067

3.a.

z = (50000 - 52000)/1200 = -2000/1200 = -1.67, so A = .453

.500 - .453 = .047

Answer = (.047)(4000) = 188 tires

3.b.

z = (53200-52000)/1200 = 1200/1200 = 1, so A = .341

.500 - .341 = .159

Answer = (.159)(4000) = 636

3.c.

z = (49600-52000)/12000 = 2400/1200 = 2, so A = .477

.477 + .500 = .977

Answer = (.977)(4000) = 3908