When we add the data value 21 to the original Set A, the data values in this new data set can be defined as X1, X2, X3, X4, X5 and 21. There are now six data values in the set, so n = We can now find the mean for the new data set, rounding the final result to two decimal places. Recall that previously determined that x1 + X2 + X3 + X4 + X5 = 50. X new X1+ X2 + X3 + X4 + X5 + 21 %3D 50 + 21

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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.