short and quick answer, i do not have much time ,please

4. Table 1 shows the sample data on waiting times (in days) at a private hospital in Taman Jaya; for a cardiothoracic (heart) surgery, categorized into two different age categories. Table 1 Age Waiting Time (days) Category 18 -34 208 210 229 213 223 168 35 - 49 229 217 218 245 222 256 232 236 244 a) Find the mean and variance for the waiting times in days. (10 marks) b) Using a = 0.05, discover whether the variance of the waiting times differ between the two age categories. (10 marks)