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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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2x+2(1960/x)=200 please help for math hw
sp2606 [1]

Two solutions:

1. x =(100-√2160)/2=50-6√ 15 = 26.762

2. x =(100+√2160)/2=50+6√ 15 = 73.238

3 0
3 years ago
Which graph represents the function?
BlackZzzverrR [31]

Answer:

The last one.

Step-by-step explanation:

The solutions with the horizontal lines are wrong because then h(x) would be -1 and 1 respectively.

The subtlety is in the open or closed dot. x ≥ -1 means that -1 is included, which is drawn as a closed dot. x < -1 means that -1 is excluded, which is drawn as an open dot.

Hence the last graph is the correct one.

4 0
3 years ago
Read 2 more answers
A store has a contest to guess the mass of 10,000 peanuts.If a peanut has a mass of about 0.45 grams, what would be a reasonable
hram777 [196]

Answer:

4,500

Step-by-step explanation:

3 0
3 years ago
Plz help me thanks so much for helping
11111nata11111 [884]

Answer:

total cost = 351.33

Step-by-step explanation:

The tax is found by multiply the cost times the tax rate

tax = 334.60 * .05

tax =16.73

Add the tax to the cost of the item to get the total cost

total cost = 16.73 + 334.60

total cost = 351.33

6 0
3 years ago
The perimeter of a rectangular goat pen is 28 meters. The pen is 5 meters wide. How long is it?
polet [3.4K]

Answer:

I think it would be 9 meters.

Step-by-step explanation:

5x2=10

28-10=18

18(divided by)2=9 meters

3 0
2 years ago
Read 2 more answers
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