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3 years ago

Help me

Mathematics

2 answers:

34kurt3 years ago

8 0

Answer:

<EFD= 47.5°

<CFD=47.5°

Step-by-step explanation:

Seeing that 85° is already there and it would be an opposite angle to <BFC all you would have to do is subtract that 85° from 180° because that's the angle of a straight line. then when you get 95° you divide it by 2.

Serggg [28]3 years ago

4 0

Efd=47.5 cfd=47.5 answer

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kap26 [50]

Answer:

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Step-by-step explanation:

given data

distribution = 4.5, 6.4, 2.3, 1.8, 5.3

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confidence interval = 95%

to find out

the population mean is between

solution

first we calculate the mean i.e.

mean = $\frac{1}{n}\sum_{i=1}^{n}x(i)$

mean = 4.5+ 6.4+ 2.3+ 1.8+ 5.3 / 5

mean = 4.06

now we calculate the standard deviation i.e.

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standard deviation = $\sqrt{\frac{1}{5-1} (4.5-5)^2+(6.4-5)^2 +(2.3-5)^2+(1.8-5)^2+(5.3-5)^2}$

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so 95 % confidence interval is i.e. mean +/- t(5) * standard deviation/ $\sqrt{n}$

here t(5) will be 2.45

95 % confidence interval= 4.06 +/- 2.45 * 2.226 / $\sqrt{5}$

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