The mean weight per student in a group of 7 students is 55 kg.The individual weight of 6 of them (in kg) are 52,54,55,53,56 and 54.Find the weight of the seventh student.

Open in App

Solution

Mean weight of 7 students =55 kg

$∴ T o t a l w e i g h t o f 7 s t u d e n t s = 55 \times 7 k g = 385 k g$

Total weights of 6 students among them =52+54+55+53+56+54=324 kg

$∴ W e i g h t o f 7 t h s t u d e n t = 385 - 324 = 61 k g$

Suggest Corrections

Similar questions

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

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.

Q. The average weight of 25 students of group A of a class is 51 kg. Whereas average weight of 35 students of group B is 54 kg. Find the average weight of 60 students of this class

The mean weight of 25 students of a class is 52 kg. If the mean weight of the first 13 students of the class is 48 kg and that of the last 13 students is 55 kg, find the weight of the 13th student.

Q. The mean weight of

120

students of a school is

52.75 k g

. If the mean weight of

50

of them is

51 k g

, find the mean weight of the remaining students.

Join BYJU'S Learning Program

The mean weight per student in a group of 7 students is 55 kg.The individual weight of 6 of them (in kg) are 52,54,55,53,56 and 54.Find the weight of the seventh student.

Mean weight of 7 students =55 kg ∴ Total weight of 7 students=55×7 kg=385 kg Total weights of 6 students among them =52+54+55+53+56+54=324 kg ∴ Weight of 7th student=385−324=61 kg

Mean weight of 7 students =55 kg

$∴ T o t a l w e i g h t o f 7 s t u d e n t s = 55 \times 7 k g = 385 k g$

Total weights of 6 students among them =52+54+55+53+56+54=324 kg

$∴ W e i g h t o f 7 t h s t u d e n t = 385 - 324 = 61 k g$