Frequency distribution,Normal distribution,Mean,Median,Mode

What is the purpose of developing a frequency distribution? What is the relationship between the relative frequency and the cumulative frequency? Could a frequency distributioncontain qualitative data? Why?

Describe the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample datarepresents a population distribution?

Do all statistical data sets have a mean, median, or mode? Why? When is the mean the best measure of central tendency? When is the median the best measure of central tendency? Explain.

Complete, Neat and Correct Answers are provided in the attached file.