PHP program for finding the standard deviation of an array

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Examples:
Input: array (2, 3, 5, 6, 7) Output: 1.5620499351813 Input: array (1, 2, 3, 4, 5) Output: 1
The following problem can be solved with the built-in functions PHP . The built-in functions used to solve the above problem are as follows:
  • array_sum ( ) : The function returns the sum of all the elements in the array.
  • count() : This function determines the number of elements currently present in the given array.
  • sqrt() : The function returns the square root of the specified number.
  • To calculate the standard deviation, we must first calculate the variance. The variance can be calculated as the sum of the squares of the differences between all numbers and the means. Finally, to get the standard deviation, we will use the formula ‚àö (variance / no_of_elements).Below is the PHP implementation to calculate the standard deviation: // function for calculating the standard deviation // array elements function Stand_Deviation ( $arr ) { $num_of_elements = count ( $arr ); $variance = 0.0; // calculate the average using the array_sum() method $average = array_sum ( $arr ) / $num_of_elements ; foreach ( $arr as $i ) { // sum of the squared differences between // all numbers and means. $variance + = pow (( $i - $average ), 2); } return (float ) sqrt ( $variance / $num_of_elements ); } // input array $arr = array (2, 3, 5, 6, 7); print_r (Stand_Deviation ( $arr ));
    ?>
    Output:
    1.8547236990991
        

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    We hope this article has helped you to resolve the problem. Apart from PHP program for finding the standard deviation of an array, check other array Python module-related topics.

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    Angelo Williams

    San Francisco | 2023-02-07

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    Angelo Galleotti

    Moscow | 2023-02-07

    Maybe there are another answers? What PHP program for finding the standard deviation of an array exactly means?. Will get back tomorrow with feedback

    Schneider Lehnman

    New York | 2023-02-07

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