60 students of Section A of Class XI, obtained 40 mean marks in Statistics, 40 students of Section B obtained 35 mean marks in Statistics. Find out mean marks in Statistics for Class XI as a whole.

60 students of Section A of Class XI, obtained 40 mean marks in Statis

1.	60 students of Section A of Class XI, obtained 40 mean marks in Statistics, 40 students of Section B obtained 35 mean marks in Statistics. Find out mean marks in Statistics for Class XI as a whole.
Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :Given: <br/> `N_(1)=<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>,barX_(1)=<a href="https://interviewquestions.tuteehub.com/tag/40-314386" style="font-weight:bold;" target="_blank" title="Click to know more about 40">40</a>,N_(2)=40,barX_(2)=35` <br/> `"We know, "barX_(12)=(barX_(1)N_(1)+barX_(2)N_(2))/(N_(1)+N_(2))` <br/> `:.""barX_(12)=(40xx60+35xx40)/(60+40)` <br/> `:.""barX_(12)=(2,400+1,400)/<a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a>=(3,800)/100=38`<br/> <a href="https://interviewquestions.tuteehub.com/tag/thus-2307358" style="font-weight:bold;" target="_blank" title="Click to know more about THUS">THUS</a>, Combinaed Arithmetic Mean = 38.</body></html>