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Sophie [7]
3 years ago
13

Please help I need this answered. Find x and explain. I’ll give brainliest.

Mathematics
1 answer:
Olenka [21]3 years ago
5 0

Answer:

I am not positive but I believe X = 6 so the total, if you add it up, would be 180

Step-by-step explanation:

64 + 110 = 174 + 6 = 180

Hope this helps

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Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and
Brums [2.3K]

Answer:

t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349      

p_v =P(t_9>10.349)=1.34x10^{-6}  

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we reject the null hypothesis, and the the actual mean is significantly higher than 48 MPa at 5% of significance.

Step-by-step explanation:

1) Data given and notation      

\bar X=51.6 represent the sample mean

s=1.1 represent the standard deviation for the sample      

n=10 sample size      

\mu_o =48 represent the value that we want to test    

\alpha=0.05 represent the significance level for the hypothesis test.    

t would represent the statistic (variable of interest)      

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.      

We need to conduct a hypothesis in order to determine if the mean score is higher than 48, the system of hypothesis would be:      

Null hypothesis:\mu \geq 48      

Alternative hypothesis:\mu > 48      

We don't know the population deviation, so for this case is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:      

t=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)      

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic      

We can replace in formula (1) the info given like this:      

t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349      

Calculate the P-value      

First we find the degrees of freedom:

df=n-1=10-1=9

Since is a one-side upper test the p value would be:      

p_v =P(t_9>10.349)=1.34x10^{-6}  

Conclusion      

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we reject the null hypothesis, and the the actual mean is significantly higher than 48 MPa at 5% of significance.        

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Fill in the blanks to express the quantities given in ratio language. Ratios must be
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Answer:

55555

Step-by-step explanation:

ggk

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An object accelerates from rest at 10m/s2 for 20s. Calculate the velocity reached. ​
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Answer:

400 m/s

Step-by-step explanation:

u=0 m/s

t=20 s

a=20 m/s²

v=u+at

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7 0
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Lee Jenkins worked the following hours as a manager for a local Pizza Hut: 67, 9,6 and 8 How many total hours did Lee
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Answer:

90 hours

Step-by-step explanation:

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Surface Area of Pyramids
iren [92.7K]

9514 1404 393

Answer:

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Step-by-step explanation:

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____

The area formulas for a square and a triangle are ...

  A = s² . . . . area of a square of edge length s

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