A 2-column table with 7 rows. Column 1 is labeled sample with entries 1, 2, 3, 4, 5, 6, 7. Column 2 is labeled Sample Mean with entries 154, 121, 160, 135, 140, 134, 129. Looking at this table of sample means, which value is the best estimate of the mean of the population? 120 136 160 168