Area under Normal Density Function
lower value (L)	-1.96
upper value (U)	1.96
mean	0
standard deviation	1
P[X <= L]	0.0249978951482204
P[X <= U]	0.97500210485178
P[L <= X < U]	0.95000420970356
1 - P[L <= X < U]	0.049995790296441