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Alexus [3.1K]
3 years ago
15

Which of the choices is the standard deviation of the sample shown here?

Mathematics
2 answers:
Assoli18 [71]3 years ago
6 0
Mean = (19 + 20 + 21 + 22 + 23)/5 = 105/5 = 21
x    x - mean   (x - mean)^2
19     -2                4
20     -1                1
21      0                0
22      1                1
23      2                4
               Sum = 10

Standard deviation = sqrt(sum(x - mean)^2 /n) = sqrt(10/5) = sqrt(2)
kati45 [8]3 years ago
5 0

Answer:

C for apex

Step-by-step explanation:


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You open a business selling school supplies and tutoring sessions. In your first week, you had $9,000 in sales. You ran a promot
vaieri [72.5K]

Answer: total net sales = $7950

Step-by-step explanation:

The formula for determining total net sales is expressed as

total net sales = Gross sales - (sales returns + allowances + discount)

Gross sales means total sales.

From the information given,

Gross sales = $9000

Discounts = $900

Returns = $150

Allowances = 0(this is because it was not given)

Therefore,

total net sales = 9000 - (900 + 150)

= 9000 - 1050

total net sales = $7950

3 0
3 years ago
I do not understand if anyone could help in steps or anything thank you. Solve for A -2(a + 7) = -9
Ne4ueva [31]
<h2>... Answer is in the pictures above... </h2><h3>... Hope this will help... </h3>

4 0
3 years ago
The point Z(-6, -6) is rotated 90° clockwise around the origin. What are the coordinates of the resulting point, Z′?
lana [24]

Answer:

z would be at (-6,6)

Step-by-step explanation:

hope that helps

4 0
3 years ago
Hi if u could help me that'd be great
WINSTONCH [101]

Answer:

1 hour and 45 minutes

and 1 hour

Step-by-step explanation:

x= run

y= walk

5x+2.5y = distance

5x+2.5(1.5)=12.5

solve for x

5x=8.75

x=1.75

1.75 in hours is 1 hour and (60*.75)=45

1 hour and 45 minutes

" If the marathon race participant ran for 2 hours, how many hours did the participant walk?"

We use the same equation

5x+2.5y=distance

we'll assume that they till walked 12.5 miles

which means that

5(2)+2.5y=12.5

solve for y

2.5=2.5y

y=1

1 hour

8 0
3 years ago
Read 2 more answers
Rewrite the equation for x, and express its value in terms of a. 3/a x - 4 = 20
My name is Ann [436]

For this case, we must clear variable "x" from the given equation, expressed in terms of "a".

We have:

3/a x-4=20

By clearing "x" we have:

Adding 4 to both sides of the equation:

3/a x = 20 + 4

Multiplying by a/3 on both sides of the equation:

x=24a/3

x=8a

So, x=8a

Answer:

x=8a

7 0
3 years ago
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