Question

If the average weight of 6 students is 50 kg, that of 2 students is 55 kg and that of rest of 2 students is 55 kg, then the average weight of all the students is ?​

Answer 1

Answer:

$\huge\underline\bold {Answer:}$

Total weight of 6 students = 6 × 50 kg = 300 kg

Total weight of 2 students = 2 × 51 kg = 102 kg

Total weight of 2 students = 2 × 55 kg = 110 kg.

Average weight of all the students = Total weight/Number of students = (300 + 102 + 110) ÷ 10 kg

= 512/10 kg

= 51.2 kg.

Therefore average weight of all students is 51.2 kg.

Answer 2

Answer:

51.2 KG

Step-by-step explanation:

We can find the required average weight with the help of given formula ,

Here, n1 = 6 , a1 = 50 kg

n2 = 2 , a2 = 51 kg , n2 = 2 , a2 = 55 kg

∴ Average =

n1a1 + n2a2 + n3a3

n1 + n2 + n3

Required average weight =

(50 × 6 + 51 × 2 + 55 × 2)

10

Required average weight =

300 + 102 + 110

10

Required average weight =

512

= 51.2 kg.

10