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4 years ago

What’s the answer I don’t understand ?

Mathematics

2 answers:

densk [106]4 years ago

6 0

Do you have a better picture?

lorasvet [3.4K]4 years ago

5 0

Answer:

It looks like D if i'm seeing correctly

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HELP ASAP I WILL MARK YOU BRAINLYEST PLEASE HURRY!!!!

Sidana [21]

X = 180 - 60 - 80
x = 40

hope it helps

3 0

3 years ago

Read 2 more answers

What is the correct answer to “2+5*4-8÷⅘=?

OLEGan [10]

Answer:

no it is not c it is b

Step-by-step explanation:

2+(5×4)-(8×5/4)

2+20-40/4

22-10

8 0

3 years ago

Julie will build a rectangular pen for her dog against a barn. A wall from the barn will form one side of the pen, She has 32 m

IRISSAK [1]

8 meters by 16 meters

6 0

4 years ago

The cost of Internet access. How much do users pay for Internet service? Here are the monthly fees (in dollars) paid by a random

Ivanshal [37]

Answer:

$20.9-2.01\frac{7.65}{\sqrt{50}}=18.73$

$20.9+2.01\frac{7.65}{\sqrt{50}}=23.07$

The 95% confidence interval would be given by (18.73;23.07)

Step-by-step explanation:

Assuming these data

20 40 22 22 21 21 20 10 20 20

20 13 18 50 20 18 15 8 22 25

22 10 20 22 22 21 15 23 30 12

9 20 40 22 29 19 15 20 20 20

20 15 19 21 14 22 21 35 20 22

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

First we need to find the sample mean with the following formula:

$\bar X= \frac{\sum_{i=1}^n X_i}{50}=20.9$

And in order to find the sample standard deviation we can use the following formula:

$s= \sqrt{\frac{\sum_{i=1}^n (x_i -\bar x)^2}{n-1}}=7.65$

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=50-1=49$

Since the Confidence is 0.95or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,49)".And we see that $t_{\alpha/2}=2.01$

Now we have everything in order to replace into formula (1):

$20.9-2.01\frac{7.65}{\sqrt{50}}=18.73$

$20.9+2.01\frac{7.65}{\sqrt{50}}=23.07$

So on this case the 95% confidence interval would be given by (18.73;23.07)

8 0

3 years ago

Savings should be treated as another type of

Taya2010 [7]

Answer:

B, Net income

Step-by-step explanation:

Savings cannot be treated as deduction as deductions are compulsory done by the employer for loans, taxes, and other liabilities as PF etc. But savings is voluntarily done by the income holder after setting aside amount for all other expenditure necessary to sustain living.

Savings cannot be treated as short term goal, as sometimes savings are for long term as children's education, marriage, old age pension, etc.

Savings cannot be treated as expenditure as expenditures are getting some goods or services by paying some money. But savings is not giving money to get service or good but to hold it for future use

THus the appropriate answer is savings is net income i.e. income over all expenditures.

8 0

3 years ago

Read 2 more answers