The main purpose of the scatter plot to understand how variables explained when we we perform multi variate analysis. Like in the the plot variables x,y and z are identical. When we perform x with y: the explanatory power has increased new insights where us to understand.
kindly read the question again, i am asking about random no generation and not about the importance of scatter plot.
randn(d0, d1, ..., dn)
Return a sample (or samples) from the “standard normal” distribution.
If positive, int_like or int-convertible arguments are provided,
randn generates an array of shape
(d0, d1, ..., dn), filled with random floats sampled from a univariate “normal” (Gaussian) distribution of mean 0 and variance 1 (if any of the are floats, they are first converted to integers by truncation).