Calculate the correlation coefficient from the following data
N = 9, ΣX = 45, ΣY = 108, ΣX² = 285, ΣY² = 1356, ΣXY = 597

From the following data calculate the correlation coefficient Σxy = 120, Σx² = 90, Σy² = 640

The following table shows the sales and advertisement expenditure of a form

Title	Sales	Advertisement expenditure(Rs.Cross)
Mean	40	6
SD	10	1.5

Coefficient of correlation r = 0.9. Estimate the likely sales for a proposed advertisement expenditure of Rs. 10 crores.

Given the following data, what will be the possible yield when the rainfall is 29"

Details	Rainfall	Production
Mean	25"	40 units per acre
Standard Deviation	3"	6 units per acre

Coefficient of correlation between rainfall and production is 0.8.

Calculate the correlation coefficient from the following data:
ΣX = 125, ΣY = 100, ΣX² = 650, ΣY² = 436, ΣXY = 520, N = 25