(1)999 people

(2)

Solution: (1) Let the frequencies represented by the four rectangles in Figure A be,

Judging from the title,,?

Then there's a solution,

Estimate the population by sample is 4997? 0.2 ? 999 people,

So it is estimated that the number of people who scored in the interval is around 999? ........................... scored 6 points.

(2) The scores of boys and girls selected in turn are recorded as X and Y respectively, so (X, Y) represents the result of one extraction.

Basic event *** 16:

(64,67)、(64,75)、(64,77)、(64,8 1)、(70,67)、(70,75)、

(70,77)、(70,8 1)、(75,67)、(75,75)、(75,77)、(75,8 1)、

(86,67)、(86,75)、(86,77)、(86,8 1)

Remember that "girls' scores are not lower than boys'" is event A, and the basic events contained in event A are:

(64,67)、(64,75)、(64,77)、(64,8 1)、(70,75)、

(70,77), (70,865,438+0), (75,75), (75,77), (75,865,438+0) * * 65,438+00,

So what? ................... 12 point