Urgent : Please help - Thank you so much

Which of the following is the most CORRECT about the weighted average cost of capital (WACC) of a firm and WACC components?

1. All else being the same, the higher the tax rate, the lower the WACC.
2. All else being the same, the lower the tax rate, the lower the WACC.
3. All else being the same, the higher the flotation cost, the higher the cost of retained earnings.
4. All else being the same, the cost of retained earnings is zero.
5. All else being the same, the lower the flotation cost, the higher the cost of retained earnings.

Which of the following is the most CORRECT about the expected value of returns?

1. If returns follow normal distribution, you actual realized return in future will be equal to the expected return almost allthe time.
2. If returns follow normal distribution, you actual realized return in future will be higher than the expected return almost all the time.
3. If returns follow normal distribution, you actual realized return in future will have no relationship with the expected return most of the time.
4. If returns follow normal distribution, you actual realized return in future will be within a certain range of the expected return most of the time.
5. If returns follow normal distribution, you actual realized return in future will be lower than the expected return almost all the time.