The mean weight per student in a group of 7 students is 55 kg. The individual weights of 6 of … 56, 54. Find the weight of the…
Answers:
x̅ = 1 / n (Σxi) ⇒ 55 = x1 + x2 + …….+ ⇒ x7 / 7
⇒ x1 + x2 + …… + x7 = 55 × 7 = 385
x1 + x2 + …… + x6 = 52 + 54 + 55 + 53 + 56 + 54 = 324
∴ x7 = 385 – 324 = 61 kg
∴ weight of the seventh student is 61 kg.
Total weight of 7 students=55×7=385
Weught if 6 students=324
Weight of seventh student=385-324=61kg
Total weight – weight of 6 students
385-324=61kg