Also known as “Gaussian distribution” or “bell curve”.

- Symmetric: If curve is divided into 2 equal parts then one half will be similar to other half.
- Unimodel: It will have only 1 mode.
- Mean=Median=Mode (All 3 will be equal).
- It is said that nor distribution “Curve will never touch x-axis”.
- Total Area under the curve ≈ 1 [68-95-99.7 rule]

Below curve shows the area covered within 1, 2 and 3 sigma regions: