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lina2011 [118]
3 years ago
15

Dans une classe, la moyenne des 20 filles au dernier contrôle de mathématiques est de 10, 41, celle des 16

French
2 answers:
AfilCa [17]3 years ago
6 0

Bonjour,

36 élèves

Les filles:

20* 10,41= 208,2

Les garçons:

16 * 12,3 = 196,8

Total:

208,2 + 196,8 = 405

Moyenne de la classe:

405 / 36  => 11,25

Agata [3.3K]3 years ago
5 0

<em>Bonjour,</em>

<em />

<em> 20 filles et 16 garçons = 36 élèves</em>

La moyenne des filles est de :

<em>20* 10,41 = </em>208,2

La moyenne des  garçons est de :

<em>16 * 12,3 =</em>  196,8

<em />

Soit :

<em>208,2 + 196,8 =  </em>405

<em />

<em>La moyenne de la classe est donc de </em>11.25

<em>405 / 36  =  </em>11,25

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