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grigory [225]
4 years ago
9

Which equation will help you solve this problem? Each boxcar in a toy train is the same length. There are 3 boxcars. Their total

length is 21 inches. How long is each boxcar?
Mathematics
1 answer:
vladimir1956 [14]4 years ago
4 0
I believe 5 is the answer
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A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past
Minchanka [31]
<h2><u>Answer with explanation</u>:</h2>

Let \mu be the distance traveled by deluxe tire .

As per given , we have

Null hypothesis : H_0 : \mu \geq50000

Alternative hypothesis : H_a : \mu

Since H_a is left-tailed and population standard deviation is known, thus we should perform left-tailed z-test.

Test statistic : z=\dfrac{\overlien{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

where, n= sample size

\overline{x}= sample mean

\mu= Population mean

s=sample standard deviation

For n= 31,\ \sigma=8000,\ \overline{x}=46,800\ \&\ s=46,800, we have

z=\dfrac{46800-50000}{\dfrac{8000}{\sqrt{31}}}=-2.23

By using z-value table,

P-value for left tailed test : P(z≤-2.23)=1-P(z<2.23)   [∵P(Z≤-z)=1-P(Z≤z)]

=1-0.9871=0.0129

 Decision : Since p value (0.0129) < significance level  (0.05), so we reject the null hypothesis .

[We reject the null hypothesis when p-value is less than the significance level .]

Conclusion : We do not have enough evidence at 0.05 significance level to support the claim that t its deluxe tire averages at least 50,000 miles before it needs to be replaced.

4 0
3 years ago
according to the paragraph 6, which of the following were reasons for detaining an immigrant on Angel Island during the early 19
Rudiy27

Answer:

<u><em>After traveling across Russia to China and Japan, they boarded ships for San Francisco. </em></u>

<u><em>Dozens of families and individuals ended up at the Angel Island Immigration </em></u>

<u><em>Station, underwent medical inspection and were detained for weeks because they did not have sufficient funds to reach their eventual destinations.</em></u>

Step-by-step explanation:

Hope this helps:)

6 0
3 years ago
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What is the absolute value of 0.6?
Nesterboy [21]
The absolute value of 0.6 is 0.6 beacause its the same thing
7 0
3 years ago
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What percent is $4.50 of $200.00​
beks73 [17]

Answer:

<h2>2.25%, or 2.25/100</h2>

Step-by-step explanation:

Since the <em>half </em>of <em>200 </em>is 100, simply divide both numbers by <em>2, </em>giving us 2.25%

4.5/2 = 2.25

8 0
3 years ago
How many seconds are in 2.94 centuries
andre [41]

Answer:9.2716e+9

Step-by-step explanation:

5 0
3 years ago
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