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F-19
Calculs statistiques
k Écart-type (Mode SD)
•Appuyez sur F F 1 (fx-85W) pour entrer dans le
mode SD pour effectuer des calculs statistiques en
utilisant un écart-type. Pour les autres modèles, appuyez
sur
F 2.
Il faut toujours d’abord appuyer sur
A m = pour vider
la mémoire statistique avant de saisir des données.
Les données saisies servent à calculer
les valeurs de
n, Σx, Σx
2
, o, σn et σn-1
que vous pouvez rappeler avec les
opérations de touches indiquées ci-
contre.
Exemple: Calculer
σnҀ1, σn , o, n, Σx et Σx
2
pour les
données suivantes : 55, 54, 51, 55, 53, 53, 54, 52
Entrez dans le mode SD
fx-85W:
F F 1
Autres modèles: F 2
A m = (effacement de mémoire)
55
S 54 S 51 S 55 S
53 S S 54 S 52 S
(Écart-type sur échantillon σnҀ1) A N =
cart-type sur population σn) A A =
(Moyenne arithmétique o) A M =
(Nombre de données n) 0 k
(Somme des valeurs Σx) 0 H
(Somme des carrés des valeurs Σx
2
) 0 G
0 1 Σx
2
0 2 Σx
0 k n
A M o
A A σn
A N σn-1
52.
00
SD
1.407885953
00
1.316956719
00
53.375
00
8.
00
22805.
00
427.
00
21


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