Question

how to solve 21 no. questions

Answer 1

Mean =sum of weigh of 4 boys/4

56*4=sum of weigh of 4 boys

224=sum of weight of 4 boys

Then

46=sum of weight of 6 girls/6

46*6=sum of weight of 6 girls

276=sum of weight of 6 girls

Sum weights =224+276=500kg

Combined Mean =500/10

50 =combined mean

50 is your answer

I hope this much will help you