The table below shows the demand for Gadgets

The table below shows the demand for Gadgets (they're like Widgets, only they're more mechanical) over a 5-month period. Calculate exponential smoothing forecasts for each month and for July. Use a coefficient of 0.5 and assume that the forecast for January was 8. Also evaluate the quality of the exponential smoothing model by calculating the root-mean-square error for the data set. Note: Round all intermediate calculations to two decimal places.
Month Demand
             Jan       10
             Feb        5
             Mar     10
             Apr       8
             May      5
             Jun      10