Question

Please please answer fast​

Answer 1

The total number of students =13

Their mean = 45 kg

So total weight of students = 13×45= 585 kg

The mean of first 7 students =47 kg

So total weight of first 7 students = 7 × 47 kg

= 329 kg

So the total weight of last 6 students = 585 kg - 329 kg = 256 kg

According to question the total weight of last 7 students = 7 × 43 kg (mean)= 301 kg

So the weight of 7th student = 301 kg - 256 kg

=45 kg (answer)