The mean number of tornado touchdowns is calculated by first summing all 12 data values presented, which results in 941, and then dividing this sum by 12. Thus, the mean is 78.4. This figure is already rounded to one more decimal place than the original data. 

Calculating the median requires ordering the data from the smallest to the largest values: 2, 3, 47, 57, 62, 68, 86, 97, 98, 99, 118, 204. Since the number of data values is even, the median will be the mean of the two middle data values in the ordered list. The two middle values are the sixth and seventh-ordered observations, or 68 and 86. Thus, the median age is found as (68 + 86)/2 = 77.0. The mode is the most frequently occurring data value or values. In these data, no value occurs more than once, so there is no mode.