A researcher recorded systolic blood pressure and body mass index in 10 men aged 35-45 years, and the data are shown in the table below. <image 1> If both systolic blood pressure and body mass index follow a normal distribution, and the information is analyzed by correlation and regression, respectively, the relationship between tr and tb is
['tr>tb', 'tr<tb', 'tr=tb', 'tr$\\ne $tb']