Question

The mean weight per student in a group of seven students is 55 kg If the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weights of the seventh student is

• A. 55kg
• B. 60kg
• C. 57kg
• D. 50kg

Answer 1

Answer: (C)

57kg

Answer 2

Total weight of 7 students is =55× 7 = 385 kg

Sum of weight of 6 students

= 52 + 58 + 55 + 53 + 56 + 54 = 328 kg

$\therefore$ Weight of seventh student = 385 – 328 = 57kg.