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VLD [36.1K]
3 years ago
14

Can someone please help me with this

Mathematics
2 answers:
stich3 [128]3 years ago
7 0

8^{2}+21^{2}=x^{2} \\64+441=x^{2} \\505=x^{2} \\x=22.5

Irina18 [472]3 years ago
3 0

The answer is 22.5 ft.

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A survey of 90 men found that an average amount spent on St. Patrick's day of $55 with a standard deviation of $18. A similar su
dem82 [27]

Answer:

The value of the test statistic is 4.70.

Step-by-step explanation:

The hypothesis for this test can be defined as follows:

<em>H</em>₀: Men do not spend more than women on St. Patrick's day, i.e. μ₁ = μ₂.

<em>H</em>ₐ: Men spend more than women on St. Patrick's day, i.e. μ₁ > μ₂.

The population standard deviations are not known.

So a <em>t</em>-distribution will be used to perform the test.

The test statistic for the test of difference between mean is:

t=\frac{\bar x_{1}-\bar x_{2}}{\sqrt{\frac{s^{2}_{1}}{n_{1}}+\frac{s^{2}_{2}}{n_{2}}} }

Given:

\bar x_{1}=55\\s_{1}=18\\n_{1}=90\\\bar x_{1}=44\\s_{1}=16\\n_{1}=86

Compute the value of the test statistic as follows:

t=\frac{\bar x_{1}-\bar x_{2}}{\sqrt{\frac{s^{2}_{1}}{n_{1}}+\frac{s^{2}_{2}}{n_{2}}} }=\frac{55-44}{\sqrt{\frac{15^{2}}{90}+\frac{16^{2}}{86} }}=4.70

Thus, the value of the test statistic is 4.70.

7 0
3 years ago
Can someone help me with this guys? Thank you so much! I mark as brainliest
Vitek1552 [10]

Answer:

y=45

x=9

z= 9 root 2

Step-by-step explanation:

This is a right isosceles triangle, so

y=45

x=9

z= 9 root 2

9²+9²=z²

81+81=z²

162=z²

√162=z

z=9√2

5 0
3 years ago
PLZ HELP Which equation could have been used to create this table?
Snowcat [4.5K]
Y=6x because once you plug in the x value you’ll get the same y values as in the table
5 0
3 years ago
Read 2 more answers
If you had 26/12 dollars, how much money would that be
Zolol [24]

Answer:

$2.17

Step-by-step explanation:

Our result when dividing 26 by 12 becomes 2.166666......

This is a problem,

Luckily, the question asks us to round to the nearest penny, or hundredths, for calculation's sake.

This brings our answer to 2 dollars and 17 cents

7 0
3 years ago
A researcher is interested in estimating the mean weight of a semi tracker truck to determine the potential load capacity. She t
uranmaximum [27]

Answer:

The degrees of freedom associated with this problem are 16.

Step-by-step explanation:

The degrees of freedom associated with a problem, independent of the confidence level, is the sample size subtracted by 1.

In this problem, we have that:

She takes a random sample of 17 trucks, so the sample size is 17.

This means that the degrees of freedom associated with this problem are 16.

4 0
3 years ago
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