I need help answering 4-9

4.9. Cross County Bicycles makes two mountain bike models, the XB-50 and the YZ-99, in three distinct colors. The following table shows the production volumes for last week: Color Model Blue Brown White XB-50 YZ-99 302 40 105 205 200 130 a. Based on the relative frequency assessment method, what is the probability that a mountain bike is brown? b. What is the probability that the mountain bike is a YZ-99? e. What is the joint probability that a randomly selected mountain bike is a YZ-99 and brown