freeCodeCamp/curriculum/challenges/german/10-coding-interview-prep/rosetta-code/averages-root-mean-square.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
594da033de4190850b893874	Averages/Root mean square	1	302228	averagesroot-mean-square

--description--

Compute the Root Mean Square (RMS) of the numbers 1 through 10 inclusive.

The RMS is calculated by taking the square root of the mean of the squares of the numbers, given by the equation:

x\_{\\mathrm{rms}} = \\sqrt {{{x_1}^2 + {x_2}^2 + \\cdots + {x_n}^2} \\over n}.

--hints--

rms should be a function.

assert(typeof rms === 'function');

rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) should equal 6.2048368229954285.

assert.equal(rms(arr1), answer1);

--seed--

--after-user-code--

const arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const answer1 = 6.2048368229954285;

--seed-contents--

function rms(arr) {

}

--solutions--

function rms(arr) {
  const sumOfSquares = arr.reduce((s, x) => s + x * x, 0);
  return Math.sqrt(sumOfSquares / arr.length);
}