84. An urn contains four balls numbered 1, 2, 3, and 4. If two balls are drawn from the urn at random (that is each pair has the same chance of being selected) and Z is the sum of the numbers on the two balls drawn, find (a) the probability distribution of Z and draw a histo- gram; (b) the distribution function of Z and draw its graph.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.