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chubhunter [2.5K]
2 years ago
6

Help I need this to help me get a grade 9

Mathematics
1 answer:
MrMuchimi2 years ago
6 0

Answer:

83

Step-by-step explanation:

the angle with 126 is supplementary and all the angles of the triangle are supplementary

180-126 = 54

54 + 43 = 97

180 - 97 = 83

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Answer:

12*15 + 4*15*1.5

180+90 = $270

Step-by-step explanation:

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3 years ago
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Whitepunk [10]
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3 years ago
Find the area of a parallelogram with a base of 5cm and height of 15 cm
Anni [7]

Answer:

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Step-by-step explanation:

amazing

7 0
3 years ago
Read 2 more answers
A journal article reports that a sample of size 5 was used as a basis for calculating a 95% CI for the true average natural freq
oksano4ka [1.4K]

Answer:

Lower = 231.134- 3.098=228.036

Upper = 231.134+ 3.098=234.232

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n=5 represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

And for this case we know that the 95% confidence interval is given by:

\bar X=\frac{233.002 +229.266}{2}= 231.134

And the margin of error is given by:

ME = \frac{233.002 -229.266}{2}= 1.868

And the margin of error is given by:

ME= t_{\alpha/2} \frac{s}{\sqrt{n}}

The degrees of freedom are given by:

df = n-1 = 5-1=4

And the critical value for 95% of confidence is t_{\alpha/2}= 2.776

So then we can find the deviation like this:

s = \frac{ME \sqrt{n}}{t_{\alpha/2}}

s = \frac{1.868* \sqrt{5}}{2.776}= 1.506

And for the 99% confidence the critical value is: t_{\alpha/2}= 4.604

And the margin of error would be:

ME = 4.604 *\frac{1.506}{\sqrt{5}}= 3.098

And the interval is given by:

Lower = 231.134- 3.098=228.036

Upper = 231.134+ 3.098=234.232

6 0
3 years ago
The angle is 1/5 of the circle. what is the measure of the angle?
LenKa [72]
360 degrees in a circle divided by 5 is 72
5 0
3 years ago
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