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drek231 [11]
3 years ago
11

What is 257/8×3 can you tell me the answer plz

Mathematics
1 answer:
Allushta [10]3 years ago
7 0
The answer is 10.7 b/c 8 times three is 24 and then you divide the number 257 by 24
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The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam
irina [24]

Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

At 95% two sided , z = 1.96

So, confidence interval would be

\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)

(b) Construct a 95% lower confidence bound on the mean life.

z = 1.65

So, confidence interval would be

\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

4 0
3 years ago
Immigration reform A news organization wants to know what percent of U.S. residents support a "pathway to citizenship" for peopl
harina [27]

Undercoverage might lead to bias in this study due to the risk of collecting data from a small number of people who feel strongly about the research study in this scenario.

<h3>What is Undercoverage bias?</h3>

This refers to a type of sampling bias which occurs when the research population aren't adequately represented in the study.

This type of sampling involves getting data from a selected few people who may have the same opinion or view about the study which doesn't depict the true representation of the population.

This makes the study to be biased which is why undercoverage is usually avoided when conducting a research.

Read more about Undercoverage bias here brainly.com/question/13294832

#SPJ1

5 0
1 year ago
Someone help me plz.
Svetllana [295]
Answer:
20%

Explanation:
What we know:
- there are 25 cans in total
- 5 of them are root beer cans

Using this information, we can say that 5/25 cans are root beer cans. To find the percent, we change the fraction into a decimal and then multiply it by 100.

To change 5/25 into a decimal, we divide the numerator and denominator.
5/25=0.2

And we multiply the decimal by 100 to get the percent:
0.2*100=20

Therefore, 20% of Cam’s cans are root beer cans.

I hope this helps!
3 0
3 years ago
O=6+x-24<br> Slope intercept form
lara [203]

Answer:

slope is undefined

Step-by-step explanation:

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3 years ago
Arks
luda_lava [24]

Answer:

EXPLAIN

Step-by-step explanation:

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2 years ago
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