雅思听力的分数算法如果想达到5分,那么如果是41道题,我需要至少做多少个?

ELTS听力评分标准（A类与G类）
Number of correct Listening answers IELTS band score
39-40 9.0
37-38 8.5
35-36 8.0
33-34 7.5
30-32 7.0
27-29 6.5
23-26 6.0
20-22 5.5
16-19 5.0
13-15 4.5
10-12 4.0
6-9 3.5
4-5 3.0
3 2.5
2 2.0
1 1.0
absent 0.0