In the average marks of three batches of 55, 60 and 45 students respectively is 50, 555 and 60, then the average marks of all the students is :
Required average = `(( 55 xx 50 + 60 xx 55 + 45 xx 60)/(55 + 60 + 45))`
= `((2700 + 3300 + 2700)/(160))` = `8750/160` = 54.68
Submit Comment/FeedBack