There are three sections of a class in a school. The number of students in the three sections is 38, 32 and 40 and the average age of the students in these sections separately is 15.3 years, 16.5 years and 15.9 years respectively. What is the average age of the class ?

a. 15.9 yrs
b. 15.92 yrs
c. 15.96 yrs
d. None

• (38*15.3+32*16.5+40*15.9)/(32+40+38)
  =15.86 approx 15.9
• 11 years agoHelpfull: Yes(5) No(0)
• d) None
  38*15.3+32*16.5+40*15.9/(38+32+40)
  38*15+38*.3+32*16+32*.5+40*15+40*.9/(110)
  570+11.4+512+16+600+3.6/110
  1713/110=15.57
• 11 years agoHelpfull: Yes(3) No(1)