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JulijaS [17]
3 years ago
14

The manufacturer of a certain type of new cell phone battery claims that the average life span of the batteries is 500 charges;

that is, the battery can be charged at least 500 times before failing. To investigate the claim, a consumer group will select a random sample of cell phones with the new battery and use the phones through 500 charges of the battery. The proportion of batteries that fail to last through 500 charges will be recorded. The results will be used to construct a 95 percent confidence interval to estimate the proportion of all such batteries that fail to last through 500 charges.
(a) Explain in context what it means to be 95 percent confident.
Mathematics
1 answer:
igomit [66]3 years ago
8 0
I don’t kn what the answer is ‍♀️‍♀️‍♀️sorry
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the temperature of dry ice is -109.5°F this is 184.2°F less than the outside temperature. What is the outside temperature?
AlladinOne [14]

Answer:

<em>74.7°F</em>

Step-by-step explanation:

You need to add 184.2°F to -109.5°F.

184.2°F + (-109.5°F) =

= 184.2°F - 109.5°F

= 74.7°F

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dezoksy [38]

Answer:

Step-by-step explanation:

It is due because you multiply the powers

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the result in both cases is  3 to the 20th power

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If AD = 6 cm, DB = 4.2 cm, AB = 8.7 cm, and ED = 3.9 cm, what is the measure of DC?
marshall27 [118]
You cannot work this out without the angles

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Greenland, the largest island in the world, is 21 times larger than Iceland. The combined area of Greenland and Iceland is 880,0
Vlad1618 [11]
Greenland is x
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g + x = 880,000   
x = 21g

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x = 880,000 - g
x = 21g

Because of the transitive property, which states that <span>for any real numbers a, b, and c: If a = b and b = c, then a = c, you can set the two things that equal x equal to each other.
21g = 880,000 - g

Then you simplify.
21g = 880,000 - g
21g + g = 880,000 -g +g
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Answer:

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Step-by-step explanation:

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