Please write the answers with explanation..if nonsense answers I will report.....so answer properly
2 answers:
Answer:
1st--> x=135
2nd-->x=74
Step-by-step explanation:
1st:
triangle =180°
180-90=90
90÷2=45
straight line=180°
180-45=135
therefore x=135°
2nd:
pentagon=540°
straight line=180°
180-92=88 for line s
180-20=160 for line q
180-85=95 for line p
180-89=91 for line r
160+95+88+91=434
540-434=106
180-106=74
therefore x=74°
hope that's okay
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Answer:
The sample mean is
b.3.55
The margin of error is
0.32
Step-by-step explanation:
Deep explanation about a confidence interval
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the mean subtracted by M. So it is 6.4 - 0.3944 = 6.01 hours.
The upper end of the interval is the mean added to M. So it is 6.4 + 0.3944 = 6.74 hours.
In this problem:
The deep explanation is not that important.
We just have to recognize that the interval has a lower end and an upper end. The distance from both the upper and the lower end to the mean is M. This means that the sample mean is the halfway point between the lower end and the upper end.
The margin of error is the distance of these two points(lower and upper end) to the mean.
In our interval
Lower end: 3.23
Upper end: 3.87
Sample mean
So the correct answer is:
b.3.55
The margin of error is
3.87 - 3.55 = 3.55 - 3.23 = 0.32
I believe the percentage of this is 50%. Half the numbers are even, and half are odd. Your fraction is
Simplified, that's a 50% probability.
Simplified, that's a 50% probability.