# 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 👻 Read also: what is the best laptop for engineering students? 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. Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R. By the way, this material is also available in other languages: Italiano PHP program for finding the standard deviation of an arrayDeutsch PHP program for finding the standard deviation of an arrayFrançais PHP program for finding the standard deviation of an arrayEspañol PHP program for finding the standard deviation of an arrayTürk PHP program for finding the standard deviation of an arrayРусский PHP program for finding the standard deviation of an arrayPortuguês PHP program for finding the standard deviation of an arrayPolski PHP program for finding the standard deviation of an arrayNederlandse PHP program for finding the standard deviation of an array中文 PHP program for finding the standard deviation of an array한국어 PHP program for finding the standard deviation of an array日本語 PHP program for finding the standard deviation of an arrayहिन्दी PHP program for finding the standard deviation of an array Angelo Williams San Francisco | 2023-02-07 I was preparing for my coding interview, thanks for clarifying this - PHP program for finding the standard deviation of an array in Python is not the simplest one. Will get back tomorrow with feedback 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 Maybe there are another answers? What PHP program for finding the standard deviation of an array exactly means?. I just hope that will not emerge anymore ```
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