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trasher [3.6K]
3 years ago
6

Ştiind că a . b = 2 019 şi a c= 2019, calculați a. (b-c)

Mathematics
2 answers:
siniylev [52]3 years ago
6 0

Answer: a × ba × c = a (bc) = 0

a × ba × c = 2019-2019 = 0

Step-by-step explanation:

____ [38]3 years ago
6 0
The answer isn’t 7 I just need more answers
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Encontrar la Esperanza Matemática y Desviación Estándar del número de imperfecciones (y) en pizarra acrílica. (2 puntos) y 0 1 2
fredd [130]

Responder:

1,625; 0.8569

Explicación paso a paso:

y ___0 ____ 1 ____ 2 ____3

P (y) _1 / 8 ___ ¼ ___ ½ ____ 1/8

Valor esperado (E (x)): Σx * p (x)

= (0 * (1/8)) + (1 * (1/4)) + (2 * (1/2)) + (3 * (1/8)) = 1,625

La desviación estándar = sqrt (Var (x))

Var (X) = Σx²p (x) * E (x) ²

Var (X) = [(0 ^ 2 * (1/8)) + (1 ^ 2 * (1/4)) + (2 ^ 2 * (1/2)) + (3 ^ 2 * (1 / 8))] - 1.625²

Var (X) = (0 * (1/8)) + (1 * (1/4)) + (4 * (1/2)) + (9 * (1/8)) - 1.625 ^ 2

= 3.375 - 2.640625

= 0,734375

Desviación estándar = Sqrt (0,734375) = 0,8569

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2 years ago
Question 1 of 25
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Step-by-step explanation:

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A tree and its shadow is proportional to Harry and his shadow. If Harry is 6 feet tall and his shadow
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Step-by-step explanation:

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