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Inessa [10]
2 years ago
8

Can someone look at the pic at tell me if Im doing this correctly? I got x=14 ty

Mathematics
1 answer:
Charra [1.4K]2 years ago
7 0

Answer:

x = 14

Step-by-step explanation:

→ Set up an equation

4x + 15 + 39 = 110

→ Simplify

4x + 54 = 110

→ Minus 54 from both sides

4x = 56

→ Divide both sides by 3

x = 14

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Hope this helps!


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3 years ago
Can a quadrilateral be both a rectangle and a rhombus
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Step-by-step explanation:

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nika2105 [10]

Answer:

The best point of estimate for the true mean is:

\hat \mu = \bar X = 2.55

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Since the time can't be negative a good approximation for the confidence interval would be (0,5.248) minutes. The interval are tellling to us that at 95% of confidence the average late time is lower than 5.248 minutes.

Step-by-step explanation:

Information given

\bar X=2.55 represent the sample mean for the late time for a flight

\mu population mean

\sigma=12 represent the population deviation

n=76 represent the sample size  

Confidence interval

The best point of estimate for the true mean is:

\hat \mu = \bar X = 2.55

The confidence interval for the true mean is given by:

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The Confidence level given is 0.95 or 95%, th significance would be \alpha=0.05 and \alpha/2 =0.025. If we look in the normal distribution a quantile that accumulates 0.025 of the area on each tail we got z_{\alpha/2}=1.96

Replacing we got:

2.55-1.96\frac{12}{\sqrt{76}}=-0.148    

2.55+1.96\frac{12}{\sqrt{76}}=5.248    

Since the time can't be negative a good approximation for the confidence interval would be (0,5.248) minutes. The interval are tellling to us that at 95% of confidence the average late time is lower than 5.248 minutes.

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Step-by-step explanation:

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