Answer:
total population of school = 1000 
1000 - 450 males = 550 female students 
550 - 200 females not in extra curriculars = 350 females in extra curriculars 
350 + 90 males in extra curriculars = 440 total in extra curriculars 
Circle A = 440 
Circle B - overlap = 200 females not in extra curriculars 
440 + 200 = 640 
1000 - 640 = 370 students represented by the portion of the Venn diagram not in either circle 
Explanation: