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
bagirrra123 [75]
2 years ago
5

How do you find variance

Mathematics
1 answer:
Pepsi [2]2 years ago
4 0
And if you need an example this is the website I went to: http://www.mathsisfun.com/data/standard-deviation.html

You might be interested in
N+3 2/5=11 3/20 what value of n makes the following equation true
makvit [3.9K]
3 2/5 3•5+2 17/5 3.4 11 3/20 223/20 11.15 +3.4=11.15
-3.4 -3.4
= 7.75

7.75+3.6 11.15
11.15=11.15
8 0
3 years ago
Which of the following is equal to [(x^2y^3)^-2/(x^6y^3z)^2]^-3
lara [203]

Answer:

A,B,D

Step-by-step explanation:

right on edge

4 0
3 years ago
Read 2 more answers
Edmundo used a number line to show the solution for the inequality |2x-6|<4 Which number line shows the solution? HURRY PLEAS
Law Incorporation [45]
Break into 2 equatins to get x's:

2x-6<4 and 2x-6>-4

Solve for x in both:

2x-6<4
2x<10
x<5

2x-6>-4
2x>2
x>1

Graph both inequalities on the same number line:

<---0-----1-----2-----3-----4-----5-----6--->
6 0
3 years ago
Read 2 more answers
In Chicago, IL, the average wind speed is 10.4 miles per hour. In Great Falls, MT, the average wind speed is 13.1 miles per hour
Fed [463]
I think Great Falls' average wind speed is greater than Chicago's by 2.7 miles
8 0
3 years ago
A rock was thrown from the top of a cliff such that its distance above sea level was given by s(t)= at² + bt + c, where t is the
frutty [35]

Answer:

<h2>a) a = -3, b = 18, c = 48; </h2><h2>s(t) = -3t²+18t+48</h2><h2>b) 48m</h2><h2>c) 8secs</h2>

Step-by-step explanation:

The question is incomplete. Here is the complete question.

'A rock was thrown from the top of a cliff such that its distance above sea level was given by s(t)=at²+bt+c, where t is the time in seconds after the rock was released. After 1 second the rock was 63 m above sea level, after 2 seconds 72 m, and after 7 seconds 27 m. a. Find a, b and c and hence an expression for s(t). b. Find the height of the cliff. c. Find the time taken for the rock to reach sea level.'

Given the equation of the distance modelled as s(t)=at²+bt+c

If after 1 second the rock was 63 m, then 63 = a+b+c

If after 2 seconds, the distance was 72 m then 72 = 4a+2b+c

Also if after 7 seconds, the distance is 27 m, then 27 = 49a+7b+c

i) Solving the 3 equations simultaneously to get a, b and c we have;

a+b+c = 63 ... 1

4a+2b+c = 72 ...2

49a+7b+c = 27 ...3

Subtracting 2 from 1 and 3 from 2 we will generate 2 new equations as shown;

eqn 2- eqn1: 3a + b = 9...4

eqn 3- eqn 2: 45a + 5b = -45

eqn 3- eqn 2: 9a+b = -9 ... 5

solving 4 and 5 simultaneously

3a + b = 9 ...4

9a+b = -9 ... 5  

Taking the difference of 4 and 5 we have

6a - -9-9

6a = -18

a = -3

substituting a = -3 into equation 4 to get b we have;

3(-3)+b = 9

-9 + b = 9

b = 9+9

b = 18

substituting a = -3 and b = 18 into equation 1 to get c we have;

-3+18+c = 63

15+c = 63

c = 48

a = -3, b= 18 and c = 48

The distance function will be s(t) = -3t²+18t+48

ii) If the height of the cliff is modelled by the equation  s(t)=at²+bt+c

The height of the cliff is at when t = 0

s(0) = -3(0)²+18(0)+48

s(0) = 48m

The height of the cliff is 48m

iii) At the sea level, the height of the rock will be 0m, substituting this into the modeled equation for the height to get the time we have;

s(t)=at²+bt+c

0 = -3t²+18t+48

3t²-18t-48 = 0

t² - 6t - 16 =0

t² - 8t+2t - 16 = 0

t(t-8)+2(t-8) = 0

(t+2)(t-8) = 0

t = -2 or 8

Taking the positive value of the time, t = 8secs

Time taken for the rock to reach sea level is 8secs

7 0
3 years ago
Other questions:
  • julia spends 2.25 on gas for her lawn mower.she earns 15.00 mowing her neighbors yard.what is julias profit?
    6·2 answers
  • Customary capacity lesson 17.2 <br> How many times can 72 pt go into a gal
    11·2 answers
  • A thief steals an ATM card and must randomly guess the correct three​-digit pin code from a 8​-key keypad. Repetition of digits
    13·1 answer
  • Find two consecutive integers whose product is 50
    7·1 answer
  • How do I prepare for the PSAT? Every time I take a practice test, I get stuck on a problem that is within my topic range, but fo
    9·1 answer
  • Find two numbers that round to 15.5 when rounded to the nearest tenth write the numbers in the box
    10·2 answers
  • Find the value of Y <br><br> A. 4 √3<br><br> B. 16 <br><br> C. 8 √3 <br><br> D. 8
    9·1 answer
  • Find A10 where<br> A-<br> ܢ<br> (<br> 1-2<br> 8<br> 0 -1 0<br> 0_0 -1
    9·1 answer
  • I'm sry pls help! im bad at math:(((​
    7·1 answer
  • Can someone help me please (brainiest and 50 points)
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!