__To find the mean & variance using c++:__
THEORY: |

For
a data set, the terms arithmetic mean, mathematical expectation, and sometimes
average are used synonymously to refer to a central value of a discrete set of
numbers.

If x1,x2,x3…….xn are a set of data, the
mean can be calculated as

Xmean=(x1+x2+………….+xn)/n

Variance
is the expectation of the squared deviation of a random variable from its mean,
& it informally measures how far a set of (random) numbers are spread out
from their mean. The variance is the square of standard deviation.

Var(X)=(1/N)*{∑

_{i=1 }(x_{i}-x_{mean})^{2}}__Standard Deviation:__

Standard deviation is a measure of the
dispersion of a set of data from its mean. It is defined as the square root of
its variance.

__CODING__**:**

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{

float x[10];

int i,n;

float avg,var,sum=0,sum1=0;

clrscr();

cout<<"N= \n";

cin>>n;

cout<<"list of number = \n";

for(i=0;i<n;i++)

{

cin>>x[i];

}

for(i=0;i<n;i++)

{

sum=sum+x[i];

}

avg=sum/n;

for(i=0;i<n;i++)

{

sum1=sum1+pow(x[i]-avg,2);

}

var=sum1/n;

cout<<"average = \n"<<avg<<endl;

cout<<"varience = \n"<<var;

getch();

}

__OUTPUT:__

####
Model syllabus (+3)*: **Downoad*

List of all practicals:

*Download*####
Get all Books: *Download*
*Physics Notes:*** ****CLICK**

*Download*

*Physics Notes:*

**CLICK**- How to Prepare for IIT-JAM ⇠ ⇠
*Click Here*

- How to prepare for JEST ⇠ ⇠
*Click Here*

**"**“Creativity is the residue of time wasted.”

*"*

**Albert Einstein**
## Post a Comment