31. A company has recorded data on the daily demand for its product (y in thousands of units) unit price (x in hundreds of dollars). A sample of 11 days' demand and associated price resu following data: Correlation between the price and the sales is -.5, sy is 14 thousands of unit (hundreds of $$). The average price during the 11 days was 14, and sales 41. Using the data above, calculate bo and bi and write out the regression equation. Using your re equation, predict y for x=20. b=r* S