3. a. A client has an investment portfolio whose mean value is equal to $500,000, with a standard deviation of $15,000. She has asked you to determine the probability that the value of her portfolio is between $485,090 and $530,000. b. A new television series is to be shown. A broadcasting executive feels that his uncertainty about the thing which the show will receive in its first month can be represented by a normal distribution with mean 18.2 and standard deviation L.6. According to this executive, the probability is 0.I that the rating will be less than what number? 7