Example 10. In a partially destroyed laboratory record of an analysis of a correlation data, the following resutls only are eligible : Variance of x = 9 Regression equations : 8x - 10y + 66 = 0, 40x – 18y = 214 What were (a) the mean values of x and y, (b) the standard deviation of y, and (c) the co-efficient of correlation between x and y.

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