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3 years ago

Solve for x -2x + 7 = 25

Mathematics

2 answers:

RSB [31]3 years ago

6 0

Answer:

-9

Step-by-step explanation:

Step 1:

-2x + 7 = 25

Step 2:

-2x = 18

Step 3:

-18 = 2x

Answer:

-9

Hope This Helps :)

Pachacha [2.7K]3 years ago

5 0

Answer: -9

Step-by-step explanation: hope this helped ❤️

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Step-by-step explanation:

Formula for confidence interval for population mean ( when population standard deviation is unknown ) :

$\overline{x}\pm t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

, where n= sample size

$\overline{x}$ = sample mean

s= sample standard deviation

$t_{\alpha/2}$ = two-tailed t-value for significance level of ( $\alpha$ ).

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Let x represents the salary of CFA charterholders .

As per given , we have

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Degree of freedom : df = 35 [ df= n-1]

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Using t-distribution table ,

$t_{\alpha/2, df}=t_{0.025,\ 35}=2.030$

95% confidence interval for the average salary of a CFA charterholders :-

$158000\pm (2.030)\dfrac{36000}{\sqrt{36}}\\\\=158000\pm 12180\\\\=(158000-12180,158000+12180) =(145820,\ 170180)$

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