According to the histogram of frequency distribution, the frequency within [0.5, 1.5] is (0.82+0.46)×0.5.

1500× (0.82+0.46 )× 0.5 = 960 (person).

A: It is estimated that there are about 960 people who participate in sports activities within [0.5, 1.5] every day.

So the answer is: 960.