Please answer for a,b,c,d

Question 4 The American Automobile Association (AAA) reported that families planning to travel over the Labor Day weekend would spend an average of $749 (The Associated Press, August 12, 2012). Assume that the amount spent is normally distributed with a standard deviation of $225 a. What is the probability of family expenses for the weekend being less that $400? b. What is the probability of family expenses for the weekend being $800 or more? c. What is the probability that family expenses for the weekend will be between $500 and $1000? d. What would the Labor Day weekend expenses have to be for the 5% of the families with the most expensive travel plans