mean u 383

stdev σ 46

x1 350

x2 400
1 z -0.72 -0.7174
2 p(x ≥ 383) 0.5 50.00%
3 p(x ≤ 350) 0.24 23.66%
4 p(x ≥ 400) 0.36 35.59%
5 p(350 ≤ x ≤ 400) 0.41 40.76%
6 p(x ≤ ____ ) = 0.20 344.29
7 p(x ≥ ____ ) = 0.20 421.71