Huaxin Co., Ltd. plans to invest 5 million yuan to build a tube factory. According to the market forecast, the expected annual income and its probability are shown in the table below.

Estimated earnings and probability table of Huaxin Company

If the electronics industry's value at risk factor is 6%, the planned annual interest rate (time value) is 8%.

(1) Calculate the expected return of the investment;

(2) Calculate the standard deviation and standard deviation rate of the investment;

(3) Import the value at risk coefficient to calculate the value at risk required by the scheme;

(4) Calculate the predicted value at risk of the scheme and evaluate whether the investment scheme is feasible.