HP 15c - Manual (Page 55)

Section 2: Working with f 55
Keystrokes Display
1.234 ´A 8.914 -01 P(1.234).
.5
´E 5.205 -01 erf(0.5).
Example: For a Normally distributed random variable X with mean 2.151 and standard
deviation 1.085, calculate the probability Pr [2 < X

3].





 
 




 




 




  
085 . 1
151 . 2 2
085 . 1
151 . 2 3
085 . 1
151 . 2 3
085 . 1
151 . 2 2
] 3 2 [
P P
X
Pr X Pr


Keystrokes Display
2 v 2.000 -00
2.151
- -1.510 -01
1.085 ÷ -1.392 -01
´A 4.447 -01 Calculates Pr[X≤2].
O3 4.447 -01 Stores value.
3 v 3.000 00
2.151
- 8.490 -01
1.085 ÷ 7.825 -01
´A 7.830 -01 Calculates Pr[X≤3].
l3 4.447 -01 Recalls Pr[X≤2].
- 3.384 -01 Calculates Pr[2<X≤3].
´•4 0.3384