3 years ago

-3 + 4x = 41 What's x

2 answers:

3 0

Move the -3 to the other side which makes it 41 + 3 = 44

So now the equation looks like 4x=44

Now divide 44 by 4, equals 11

x=11

Bond [772]3 years ago

3 0

Answer:

x=11 I hope it helps you

Step-by-step explanation:

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Answer: (17.42, 20.78)

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As per given , we have

Sample size : n= 9

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Population standard deviation is not given , so it follows t-distribution.

Sample standard deviation : s= 1.5 years

Confidence level : 99% or 0.99

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Degree of freedom : df= 8 (∵df =n-1)

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$19.1\pm (3.355)\dfrac{1.5}{\sqrt{ 9}}\\\\=19.1\pm1.6775\\\\=(19.1-1.6775,\ 19.1+1.6775)\\\\=(17.4225,\ 20.7775)\approx(17.42,\ 20.78)$

Hence, the 99% confidence interval for the population mean is (17.42, 20.78) .

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