The table below shows the number of runners in four marathons with times in various
ranges. the times of the runners in which marathon represent an extreme distribution:
marathon a marathon b marathon c marathon d
greater than
2: 30 but less
122
139
155
171
than 3: 00
greater than
3: 00 but less
148
150
198
213
than 3: 30
greater than
3: 30 but less
244
268
than 4: 00
greater than
4: 00 but less
206
162
202
227
than 4: 30
greater than
4: 30 but less
267
134
161
189
than 5: 00
179
188
a. marathon a
b. marathon b
c. marathon c
d. marathon d