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3 years ago

15

the original price of a scarf was $16. During a store-closing sale, a shopper saved $12 on the scarf. What percentage discount d

id she receive?

2 answers:

Vlada [557]3 years ago

8 0

Answer:

75%

Step-by-step explanation:

Original price = $16

Discount value = $12

% discount = Discount Value / Original Price x 100%

= (12/16) x 100

= 75%

Len [333]3 years ago

3 0

13% I believe 16/12=1.3

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VARVARA [1.3K]

Answer:

A. T= S+I

B. T= 325m+ 3600

C. T= 11,400

Step-by-step explanation:

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3 years ago

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Listed below are systolic blood pressure measurements (mm Hg) taken from the right and left arms of the same woman. Consider the

Dafna1 [17]

Answer:

a) $\bar d= \frac{\sum_{i=1}^n d_i}{n}=72.2$

$s_d =\sqrt{\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1}} =9.311$

b) The 90% confidence interval would be given by (63.330;81.070)

$63.330 < \mu_{left}- \mu_{right}$

Step-by-step explanation:

1) Previous concepts and notation

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".

Let put some notation

x=left arm , y = right arm

x: 175 169 182 146 144

y: 102 101 94 79 79

The first step is define the difference $d_i=x_i-y_i$ , that is given so we have:

d: 73, 68, 88, 67, 65

The second step is calculate the mean difference

$\bar d= \frac{\sum_{i=1}^n d_i}{n}=72.2$

The third step would be calculate the standard deviation for the differences, and we got:

$s_d =\sqrt{\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1}} =9.311$

2) Confidence interval

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

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

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

$df=n-1=5-1=4$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,4)".And we see that $t_{\alpha/2}=2.13$

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

$72.2-2.13\frac{9.311}{\sqrt{5}}=63.330$

$72.2+2.13\frac{9.311}{\sqrt{5}}=81.070$

So on this case the 90% confidence interval would be given by (63.330;81.070)

$63.330 < \mu_{left}- \mu_{right}$

3 0

3 years ago

the value of n is both 5 times as much as the value of m and 36 more than the value of m. what are the values of n and m? explai

Ray Of Light [21]

You said that n = 5m

AND    n = m + 36 .

Well then, if those two quantities are both equal to 'n', then
they must be equal to each other, and we can write

   5m = m + 36

Subtract 'm' from each side: 4m =   36

Divide each side by 4 : m =    9 .

OK. We're half done.

Way back at the beginning, the first thing you told me
was that 'n' is 5 times the value of 'm'.

   n = 5 (m)

Well ! Now we know what 'm' is, so

   n = 5 (9) = 45 .

8 0

3 years ago

Kerry has 5 metal and 3 wood

Ray Of Light [21]

Expression

(5+3)+(5x2)=p

Solution

18

(Step-by-Step)

In this expression we simply have to use basic PEMDAS (Parenthesis Equation Multiplication Division Addition Subtraction) Order.

We start by working out the parenthesis

5 + 3 and 5 x 2

First let's work out our metal and wood paperweights

5+3=8

Simple enough, we have 8 metal AND wood paperweights

Now we have to work out our glass paperweights.

We have twice as many glass as we do metal PW's meaning we need to multiply the 5 metal paperweights by 2

5x2=10

This simplifies and boils our equation down to

8+10

simply solve and add the two and you have your answer

18

6 0

4 years ago

I promise I will mark brainlest at the first chance I get.

Len [333]

Answer:

$24$

Step-by-step explanation:

Easy. I got it right.

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3 years ago

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