1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ELEN [110]
4 years ago
15

Find the standard deviation. Round to the nearest tenth. 1, 2, 11, 8, 16, 16,20, 16, 18 OA. 6.5 O B. 6.9 O C. 1.5 ? D. 7.4

Mathematics
1 answer:
NikAS [45]4 years ago
6 0

Answer:

A. 6.5

Step-by-step explanation:

First we find the average  \bar{x} of the 9 data:

\bar{x} =\frac{\sum_{x=1}^{n}x_{i}}{n}

Where n is the data number, that in this case is 9.

\bar{x} =\frac{1+ 2+ 11+ 8+ 16+ 16+20+ 16+ 18}{9}=12\\

The formula of the standard deviation \sigma is:

\sigma=\sqrt{\frac{\sum_{x=1}^{n}(x_{i}-\bar{x})^{2}}{n}}

We replace the data and find the value of the standard deviation:

\sigma=\sqrt{\frac{(1-12)^{2}+(2-12)^{2}+(11-12)^{2}+(8-12)^{2}+(16-12)^{2}+(16-12)^{2}+(20-12)^{2}+(16-12)^{2}+(18-12)^{2}}{9}}

\sigma=\sqrt{\frac{(-11)^{2}+(-10)^{2}+(-1)^{2}+(-4)^{2}+(4)^{2}+(4)^{2}+(8)^{2}+(4)^{2}+(6)^{2}}{9}}=6,54

We approximate the number and the solution is 6,5

You might be interested in
Plz help me on this need to get my grade up
galina1969 [7]

Ok so m=2 and b=6

So we just have to put it into an equation.

y=2x+6


7 0
3 years ago
Read 2 more answers
Solve the inequality <br>4^2 - 25 &lt; 0​
Mnenie [13.5K]

Answer:

true

Step-by-step explanation:

42−25<0

−9<0

4 0
3 years ago
How do i simplify the equation tan-5θ-tanθ÷ 1+tan-5θtanθ
iren [92.7K]

Answer:-tan (50) -tan (0) - tan (50) tan (0)

Step-by-step explanation:

any expression divided by one stays the same; simplify the expression using the symmetry of trigonometric functions.

7 0
3 years ago
Please help ASAP!!!!!​
Sedaia [141]

Answer: OPTION C

Step-by-step explanation:

Complete the square:

Having the equation in the form ax^2+bx=c, you need to add (\frac{b}{2})^2 to both sides of the equation:

You can identify that "b" in the equation x^2+6x=5 is:

b=6

Then:

(\frac{6}{2})^2=3^2

Add this to both sides:

x^2+6x+3^2=5+3^2

Rewriting, you get:

(x+3)^2=14

Solve for "x":

 x+3=\±\sqrt{14}\\\\x+3=\±\sqrt{14}\\\\x=\±\sqrt{14}-3

Then, the solutions are:

x=-3+\sqrt{14}\ or\ x=-3-\sqrt{14}

8 0
3 years ago
Antonia is keeping track of the number of pages she reads. She started the school year having already read 95 pages her book, an
nirvana33 [79]
F(x) represents how many books in total and x represents the number of days
8 0
4 years ago
Read 2 more answers
Other questions:
  • What is the difference write the number 60-20
    14·2 answers
  • *HELPPP* can someone answer atleast some of these !!
    8·2 answers
  • 17 20ths as a decimal.
    13·1 answer
  • Which statement is correct? A) 13/ 3 &lt; 4.25 &lt; 43 /10 B) 43 /10 &lt; 13 /3 &lt; 4.25 C) 4.25 &lt; 13 /3 &lt; 43/ 10 D) 4.25
    12·2 answers
  • Charles ran 3 miles in 15 minutes. At that rate, how long would it take him to run 8 miles?
    7·2 answers
  • 1. There are 24 bottles of drinks in a box. How many bottles are there in 8 of such boxes?
    9·2 answers
  • S, u, n are collinear. what point is between the other two if nu = 1, su = 2, sn = 3?
    5·1 answer
  • Name a fraction equivalent to 2/3
    10·2 answers
  • PLSS HELPPP FASTT I NEED HELP ITS IREADYY PLEASEEE HELPPP!! WILL GIVE BRAINLIEST TO WHO IS CORRECT!! PLSS HELPP!!
    9·1 answer
  • Last year the Debate Club had 7 members. This year there are 9 members in the club. Estimate the percent change inthe number of
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!