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ale4655 [162]
3 years ago
9

Triangle ABC,Shown in the diagram below is an isosceles triangle

Mathematics
2 answers:
masha68 [24]3 years ago
6 0
Since it's isosceles, ∠ABC = (180-30) / 2 = 75
Katarina [22]3 years ago
3 0
I hope this helps you


ACB=ABC=180-30/2=75


angle C=angle B


A+B+C=180


2B+30=180



OR



2C+30=180


B=C=75
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Answer:

t=\frac{58.875-60}{\frac{5.083}{\sqrt{8}}}=-0.626    

The degrees of freedom are given by:

df=n-1=8-1=7  

The p value would be given by:

p_v =P(t_{(7)}  

Since the p value is higher than 0.1 we have enough evidence to FAIl to reject the null hypothesis and we can't conclude that the true mean is less than 60

Step-by-step explanation:

Information given

60, 56, 60, 55, 70, 55, 60, and 55.

We can calculate the mean and deviation with these formulas:

\bar X= \frac{\sum_{i=1}^n X_i}{n}

s=\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}

Replacing we got:

\bar X=58.875 represent the mean

s=5.083 represent the sample standard deviation for the sample  

n=8 sample size  

\mu_o =60 represent the value that we want to test

\alpha=0.1 represent the significance level

t would represent the statistic

p_v represent the p value

Hypothesis to test

We want to test if the true mean is less than 60, the system of hypothesis would be:  

Null hypothesis:\mu \geq 60  

Alternative hypothesis:\mu < 60  

The statistic would be given by:

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

Replacing the info we got:

t=\frac{58.875-60}{\frac{5.083}{\sqrt{8}}}=-0.626    

The degrees of freedom are given by:

df=n-1=8-1=7  

The p value would be given by:

p_v =P(t_{(7)}  

Since the p value is higher than 0.1 we have enough evidence to FAIl to reject the null hypothesis and we can't conclude that the true mean is less than 60

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3 years ago
Who could help me solve this
Monica [59]
6561 hope this helps 
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Radda [10]
2arctan(2/5) = 44°
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What is 2x2x2x2+2+2+2divitide by 6
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Answer:

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Step-by-step explanation:

I did the work on a calculator.

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