PLEASE HELP WITH ALL WILL THANK AND MARK BRAINLIEST

1.) C

2.)A

3.)D

4.)C

5.)D

6.) The answer is not true, the real answer is 51564

7.)22836

8.)234367

9.)14492

10.)28042

11.)C

12.) I can't see what 12 says.

The stem and leaf plot will look like:
6 | 1 5 8 - 3 scores
7 | 1 7 7 9 - 4 scores
8 | 2 3 4 5 7 9 - 6 scores
9 | 0 1 4 7 9 - 1 score
To total up the number of students who scored less than 90, we have 3 under 60-69, 4 under 70-79, and 6 under 80-89, so this is 3 + 4 + 6. This is the third choice.