0 votes 0 votes In a class of 45 students, the mean mark of 25 girls is 32 and the mean mark of 20 boys is 27.5. What is the class mean? (a) 32 (b) 27.5 (c) 29.75 (d) 30 Linear Algebra engineering-mathematics isro-mech linear-algebra + – sh!va asked Mar 7, 2017 edited Mar 8, 2019 by Naveen Kumar 3 sh!va 346 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 0 votes 0 votes 25*32 + 20*27.5/45 = 30 Akriti sood answered Mar 7, 2017 selected Mar 7, 2017 by Rahul Jain25 Akriti sood comment Share Follow See all 0 reply Please log in or register to add a comment.