Statistics : Skewing

Positively Skewed.

* The right side whisker is longer due to the presence of outliers. ( a few high values)

* The bulk of the data is in the lower end.

* The Median is closer to the Q1 quartile.

*The left side whisker is longer due to the presence of outliers (small values)

* The median is closer to the right side / upper quartile.

* The bulk of the data is on the higher end or values.

* B - The data is close to being symmetrical / slightly symmetrical.

* A - The data is negatively skewed.

* IQR of A is less than the IQR of B.

*The bulk of the data in A had less spread than the bulk of the data in B.

* IQR of A is more constricted and IQR of B is more spread out.

Remember : IQR (inter- quartile range ) = Q3 - Q1

Find the Standard Deviation of the following marks (Test out of 20) for Class A.
3 , 5 ,11 , 8 , 4 ,15, 17, 19, 6, 9. 
n = 10 

Find the S.D of the following set of data (Test out of 20) for Class B.
10 , 9, 15, 16, 17, 18, 20, 19, 11, 15

 $Mean\ =\frac{\in x}{n}=\frac{150}{10}=15$