(1)① and ② are one-sided, so ③ is more reasonable;

(2) 1 appears the most, 94 times, then the mode is1;

* * * has 200 numbers, so the median is the average of the numbers 100, 10 1.

The median of ∴ is 2; ?

So, the answer is: 1, 2;

(3) Incorrect and correct average:. x = 1×94+2×52+3×38+4× 16200 = 1.88？ (hours),

So, the answer is: 1.88 hours;

(4) According to the meaning of the question: 300× (52+38+16) ÷ 200 =159 (ten thousand people)?

A: The number of people who exercise for 2 hours or more every day in this city is 6.5438+0.59 million.

So the answer is: 654.38+0.59 million.