a)
Φ((60-100)/15) = Φ(-8/3) ≈ 0.38%
b)
1 - Φ((140-100)/15) = 1- Φ(8/3) ≈ 1- 0.9962 = 0.38%
da |140-100| = |60-100|
c)
1 - 2*Φ(-8/3) ≈ 1 - 2*0.38% = 99.24%
a)
Φ((60-100)/15) = Φ(-8/3) ≈ 0.38%
b)
1 - Φ((140-100)/15) = 1- Φ(8/3) ≈ 1- 0.9962 = 0.38%
da |140-100| = |60-100|
c)
1 - 2*Φ(-8/3) ≈ 1 - 2*0.38% = 99.24%