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Annette [7]
3 years ago
11

Of the 125 people in the community choir, 22 of them actually come from other communities. What fraction of the choir comes from

other communities
Mathematics
1 answer:
algol133 years ago
8 0
First you have to find out how many make a certain percent so..125/100=1.25 meaning that 1 person repsresent's 1.25%
   
 
 
So 22*1.25= 27.5% meaning 27.5% came from other comunities!


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Step-by-step explanation:

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7 measured data points have a sample mean of 1403 and a standard deviation of 27. Determine the best estimate of the mean value
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Answer:

Step-by-step explanation:

Hello!

You have sample of n=7 with mean X[bar]= 1403 and standard deviation S=27 and are required to estimate the mean with a 95%CI.

Asuming this sample comes from a normal population I'll use a stuent t to estimate the interval (a sample of 7 units is too small for the standard normal to be accurate for the estimation):

[X[bar]±t_{n-1;1-\alpha /2} * \frac{S}{\sqrt{n} }]

t_{n-1;1-\alpha /2} = t_{6;0.975}= 2.365

[1403±2.365*\frac{27}{\sqrt{7} }]

[1378.87;1427.13]

The margin of error is the semiamplitude of the interval and you can calculate it as:

d= \frac{Upbond-Lowbond}{2}= \frac{1427.13-1378.87}{2} = 24.13

With a confidence level of 95% you'd expect that the real value of the mean is contained by the interval [1378.87;1427.13], the best estimate of the mean value is expected to be ± 24.13 of 1403.

I hope it helps!

4 0
3 years ago
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8 represents the rate of change while 6 represents the initial value

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width = 6
length = 6
area = 36 square yards (6×6)
perimeter = 24 yards (6+6+6+6)
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3 years ago
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