Gaussian / Normal Distribution:

• Right and left side of distribution are symmetrical.
• Around 68% is within first deviation from mean.
• Around 95% is within second deviation from mean.
• Around 99.7% is within third deviation from mean.

Z score: how much far a value is from mean in terms of standard deviation.

Standard Normal Distribution: distribution of z scores of X.

• Mean is 0 and std.dev is 1
• Transforming normal to standard normal distribution is called Standardization.

To plot:

• seaborn.boxplot
• seaborn.histplot
• seaborn.countplot

To calculate mean, median.. use numpy