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:

$total \: weight \: of \: 6 \: students \: = \: 60 \times 50 \: = 300kg$

$total \: weight \: of \: 2 \: students \: = 2 \times 51 \: = 102kg$

$total \: weight \: of \: 2 \: students = 2 \times 55kg \: = 110kg$

$average \: weight \: of \: all \: the \: students \:$

$= \frac{total \: weight}{number \: of \: students} = \frac{300 + 102 + 110}{10kg}$

$= \frac{512}{10} kg$

$= 51.2kg$

$therefore, \:$

$average \: weight \: of \: all \: students \: is \: 51.2kg$