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Mashcka [7]
3 years ago
14

En una prueba de duración para determinar la vida útil de un nuevo tipo de lámpara lanzada al mercado, los datos de la muestra s

e distribuyeron de manera casi normal. Se calculó una vida útil
promedio de 7000 hrs. y una desviación de 520 hrs. Halla el porcentaje de lámparas que tendrán
una vida útil
a) entre la media y 7600hrs.
b)entre 6500 hrs y 7600 hrs.
c) mas de 7600
Mathematics
1 answer:
diamong [38]3 years ago
6 0

Answer:

no habla espenol :((

Step-by-step explanation:

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How do you solve 2(x+7)+x=20
alexira [117]
2(x+7) + x=20
(2)(x) + (2)(7) + x=20  Distribute 
2x+14 + x =20
(2x+x) + (14) =20  Combine Like Terms 
3x+14=20 
    - 14  -14             Subtract 14 from both sides 
3x = 6 
3x/3 6/3                  Divide Both Sides by 3 
 
x = 2 


Let me know if you still don't understand 

4 0
3 years ago
When finding the difference between 2.4 and a number, the answer is 1.57. What number should go in the box to complete the subtr
Airida [17]

Answer:

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Step-by-step explanation:

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4 0
2 years ago
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Naily [24]

Answer:

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Financial planning refers to long term goals that are planned and reached over an extended period of time to keep one solvent in cases of emergency without having a direct effect on current income.

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