# Mean Variance and Standard Deviation examples and calculator in data mining

### Enter the values of which you want to find MEAN VARIANCE AND STANDARD DEVIATION:

Enter first value here:-

Enter second value here:-

Enter third value here:-

Enter fourth value here:-

## Result of what you enter

[insert_php] if(isset(\$_POST[‘submit’]))
{
\$a=\$_POST[‘value1’];
\$b=\$_POST[‘value2’];
\$c=\$_POST[‘value3’];
\$d=\$_POST[‘value4’]; //posted user’s values to varriables

\$mean=(\$a+\$b+\$c+\$d)/4; //actual logic of calculation by formula starting
\$varienceA=(\$a-\$mean);
\$sqrA=\$varienceA*\$varienceA;
\$varienceB=(\$b-\$mean);
\$sqrB=\$varienceB*\$varienceB;
\$varienceC=(\$c-\$mean);
\$sqrC=\$varienceC*\$varienceC;
\$varienceD=(\$d-\$mean);
\$sqrD=\$varienceD*\$varienceD;
\$sum=\$sqrA+\$sqrB+\$sqrC+\$sqrD;
\$finalvarience=\$sum/4;
\$standarddeviation= sqrt(\$finalvarience); //ALL calculations completed

//results being showed in a table with users inputs after calculations
echo ‘

‘;echo “”;echo””;
echo””;
echo””;
echo””;
echo””;
echo “”;echo “”;echo””;
echo””;
echo “”;echo “”;echo””;
echo””;
echo “”;echo “”;echo””;
echo””;
echo “”;}[/insert_php] Formula

EXAMPLES EXAMPLE 1EXAMPLE 2

DATA YOU ENTERED” .\$a.”” .\$b.”” .\$c.”” .\$d.”
MEAN CALCULATED FOR DATA” .\$mean.”
VARIANCE CALCULATED FOR DATA” .\$finalvarience.”
STANDAR DEVIATION CALCULATED FOR DATA” .\$standarddeviation.”
Formula for Mean
mean = (A + B + C + D) /4
Formula for Varience of Data
VA=(A-mean)
VB=(B-mean)
VC=(C-mean)
VD=(D-mean)
sqrA= (VA*VA)
sqrB= (VB*VB)
sqrC= (VC*VC)
sqrD= (VD*VD)
Sum = sqrA + sqrB + sqrC + sqrD
Varience = Sum/4
Formula for Standard Deviation
Standard Deviation = sqrt(Varience)
ValuesMean of DataVarience Of DataStandard Deviation of Data
12, 15, 17, 1915.756.68752.5860
ValuesMean of DataVarience Of DataStandard Deviation of Data
105, 157, 193, 185160118734.4528