Question

The mean weight of a group of seven boys is 56 kg. The individual weights (in kg) of six of them are 52, 57, 55, 60, 59 and 55. Find the weight of the seventh boy.

Answer 1

Answer:

weight of the 7th boy = 54 kg

Step-by-step explanation:

let x be the weight of the 7th boy.

avg. of a gp of 7 boys = 56

(52+57+55+60+59+55+x)/7 = 56

338 + x = 56 * 7

338 + x = 392

x = 392-338

x = 54

Answer 2

Answer:

Step-by-step explanation:

The mean weight of 7boys is 56

The weight of individuals is 52,57,55,60,59and55

Arranging it in ascending order 52,55,55,x,57,59and 60

Odd no. Mean =n+1/2

7+1/2=4th term =x=56