Answer:
The answer to your question is: y = 80°
Step-by-step explanation:
The sum of the internal angles in a polygon is = 180°(n - 2)
= 180° (6 - 2)
= 180(4)
= 720°
y° + y° + 2(2y -20) + 2(2y -20) = 720
2y° + 4(2y -20) = 720
2y° + 8y -80 = 720
10y = 720 + 80
10 y = 800
y = 800 / 10
y = 80°
2y - 20 = 2(80) -20 = 160 -20 = 140
80° + 80° * 140 + 140 + 140 + 140 = 720°
Answer:
For this case we know that the confidence level is 90% so then the significance level is 
and 
. And we can find in the normal standard distribution a value who accumulates 0.5 of the area on each tail and we got:
And the best option would be:
1.645
Step-by-step explanation:
We assume that the parameter of interest is 
and we can assume that the distribution for this parameter is normally distributed so then the confidence interval assuming a two sided interval is given by:
Where 
represent the estimator for the parameter, SE the standard error and 
the critical value.
For this case we know that the confidence level is 90% so then the significance level is and . And we can find in the normal standard distribution a value who accumulates 0.5 of the area on each tail and we got:
And the best option would be:
1.645
X= -22.25. You subtract the 4.5 so the x can by it self
