crislainereis15 crislainereis15

18-12-2015
Mathematics

contestada

uma urna contem 7 bolas brancas, 5 bolas pretas e 4 bolas vermelhas. qual a probalidade de retirarmos, ao acaso, uma bola preta?

Respuesta :

18-12-2015

A urna contém 16 bolas no total. 5 deles são pretas.

A probabilidade de retirarmos uma bola preta é

5 / 16 = 0.3125 = 31.25% .

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