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# Summary Statistics

Unsolved
###### Prob. and Stats

Difficulty: 2 | Problem written by hemdan219@gmail.com
##### Problem reported in interviews at

Given a list of 1D points, your task is to calculate the mean, variance, and standard deviation.

$$X_{mean}= { \sum_{i=1}^{N} X_i\over N}$$

$$X_{std}= {\sqrt{ \sum_{n=i}^{N} X_i - X_{mean}\over N-1} }$$

$$X_{variance}= { (X_{std})^2}$$

Return a tuple of the mean,variance, and standard deviation of the points.

##### Sample Input:
<class 'list'>
x: [1, 2, 2, 4]

##### Expected Output:
<class 'tuple'>
(2.25, 1.1875, 1.0897247358851685)

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numpy has been already imported as np (import numpy as np)