please help

The following is a sample of selected data showing the average costs of attending Universities in Kenya in US dollars: 220, 184, 167, 213, 238, 154, 296, 211, 261, 241, 194, 187, 158, 253, 291, 212, 233, 201, 217, 179, 214, 222, 213, 232, 217, 897, 193, 173, 297, 215, 230 Use systematic sampling method to select a sample of 8. From the selected sample, what sample size will give the lowest 22% with the mean being not more than 126 of the population mean? (4 marks)