The electric power consumed each month by a chemical plant is thought to be related to the average ambient temperature x₁, the number of days in the month x₂, the average product purity x3, and the tons of product produced x4. The past year's historical data are available and are presented in the following table. y 240 236 290 274 301 316 316 300 296 267 276 288 261 4 251 5 60 5 2 0 4 5 0 0 8 I1 31 45 72 75 I2 65 25 60 24 50 21 38 24 25 80 25 87 84 25 86 88 91 26 94 24 I3 91 90 88 88 87 25 91 91 25 23 90 89 I4 100 95 110 88 94 *ēē58481 Ify=a + a₁x₁ + a₂x₁₂ + a₂²x₁₂ + ax₂₁₂ represents the regression model. What is the value of a? Use 2 decimal places. 0 11 22 4

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