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What are the importance of frequency
The importance is that the sum of a large number of independent random variables is always approximately normally distributed as long as each random variable has the same distribution and that distribution has a finite mean and variance. The point is that it DOES NOT matter what the particular distribution is. So whatever distribution you start with, you always end up with normal.
I remember them as possession, ownership, negotiation, financing, pricing and promotion.
Vertical intergration is where a company moves down the chain of distribution for example Thomas Cook is a tour operator and then it became a travel agents as well
Yes. When we refer to the normal distribution, we are referring to a probability distribution. When we specify the equation of a continuous distribution, such as the normal distribution, we refer to the equation as a probability density function.