mean-of-array-after-removing-some-elements

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Algorithms

Given an integer array <code>arr</code>, return the mean of the remaining integers after removing the smallest <code>5%</code> and the largest <code>5%</code> of the elements.

Answers within <code>10-5</code> of the actual answer will be considered accepted.

&nbsp;
Example 1:

<pre>
Input: arr = [1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3]
Output: 2.00000
Explanation: After erasing the minimum and the maximum values of this array, all elements are equal to 2, so the mean is 2.
</pre>

Example 2:

<pre>
Input: arr = [6,2,7,5,1,2,0,3,10,2,5,0,5,5,0,8,7,6,8,0]
Output: 4.00000
</pre>

Example 3:

<pre>
Input: arr = [6,0,7,0,7,5,7,8,3,4,0,7,8,1,6,8,1,1,2,4,8,1,9,5,4,3,8,5,10,8,6,6,1,0,6,10,8,2,3,4]
Output: 4.77778
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>20 &lt;= arr.length &lt;= 1000</code></li>
	<li><code>arr.length</code> is a multiple of <code>20</code>.</li>
	<li><code>0 &lt;= arr[i] &lt;= 105</code></li>
</ul>