Question
If the position of the letters in the word
“FORMALITIES” are rearranged in such a way that the position of S remains the same position, then the first and the tenth letter are interchanged, similarly the position of the second and ninth letters are interchanged and so on, from the left end then which of the following will be the fourth from the left end after the rearrangement?Solution
F O R M A L I T I E S E I T I L A M R O F S
For the given data, n=20, X̅ = 40, Y̅ = 60, ∑(X-10)2 = 100, ∑(Y-30)2 =160 and    ∑(X-10)*(Y-30) = 80. Calculate the r...
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