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antiseptic1488 [7]
3 years ago
11

(NEEDS TO BE ANSWERED QUICKLY) The temperature fell from 0 Degrees Fahrenheit to 15 and one-half Degrees Fahrenheit below 0 in 5

and three-fourths hours. Wen tried to find the change in temperature per hour. Her work is shown below.
Negative 15 and one-half divided by 5 and three-fourths = negative StartFraction 31 over 2 EndFraction divided by StartFraction 23 over 4 EndFraction = negative StartFraction 31 over 2 EndFraction times StartFraction 23 over 4 EndFraction = Negative StartFraction 713 over 8 EndFraction

A. When she checked the answer by estimating, it did not make sense. What error did Wen make?
B. Wen incorrectly converted a mixed number to an improper fraction.
C. Wen added the numerators and denominators instead of multiplying.
D. Wen did not take the reciprocal of the divisor.
E. Wen did not change the division problem to multiplication.
Mathematics
1 answer:
Alenkasestr [34]3 years ago
4 0

Answer:

C

Step-by-step explanation:

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An electronic device factory is studying the length of life of the electronic components they produced. The manager selects two
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Answer:

The confidence interval will be given by:

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Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In the context of this problems:

It means that the sampling distributions of the sample mean of 500 components will be approximated normal, with mean 200,000 and standard deviation s = \frac{1000}{\sqrt{500}} = 44.72

To build the confidence interval:

The confidence interval for the average length of life of the electronic components they produced will be given by:

200000 \pm 44.72z, in which z is related to the confidence level.

For a confidence level of x%, z is the value in the z-table that has a pvalue of 1 - \frac{1 - z}{2}

3 0
3 years ago
I want to know the value
Bess [88]

Answer:

x = 2/5

Step-by-step explanation:

x^3=\dfrac{0.008}{0.125}=\dfrac{8}{125}=\dfrac{2^3}{5^3}\\\\x=\sqrt[3]{\dfrac{2^3}{5^3}}=\dfrac{\sqrt[3]{2^3}}{\sqrt[3]{5^3}}=\dfrac{2}{5}

The value of x is 2/5.

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