An investor considers a portfolio consisting of corporate bonds and real estate investment trust. He wants to find out possibilities of gaining if changes are to be made in the entire portfolio. Assuming that the investment is normally distributed, with a mean price of 150 OMR and a standard deviation of 50 OMR. a) What is the probability that the price of a new investment is more than 200 OMR? b) What is the percentage that it is more than 130 OMR but less than 175 OMR?