Let X and Y are two independent random variables. Suppose that we know Var(2X-Y)=6 and Var(X+2Y)=9,then find Var(X) and Var(Y)

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.

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