Question: (c) A time series was fitted by the ARIMA (1, 1) model (1 -0.8B)(Z, - u) = (1 -0.5B)a; where 6 = 158 and a

(c) A time series was fitted by the ARIMA (1, 1) model (1 -0.8B)(Z, - u) = (1 -0.5B)a; where 6 = 158 and a = 75 where obtained. The last three observations of the series were Z23 = 84, Z24 = 90 and Z25 = 95. Taking a25 = 1, calculate the forecasts for the next three observations

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