4. A study of prices of a certain commodity at Hapur and Kanpur yield the following data : Нарur Каприr Rs. Rs. Average price per kilo 2-463 2-797 Standard deviation 326 -207 r between prices at Hapur and Kanpur + 0-774 Estimate from the above data the most likely price (a) at Hapur corresponding to the price of Rs. 2-334 per kilo at Kanpur, (b) at Kanpur corresponding to the price of 3:052 per kilo at Hapur.

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