Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 5)
5.
The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?
Answer: Option
Explanation:
Total weight increased = (8 x 2.5) kg = 20 kg.
Weight of new person = (65 + 20) kg = 85 kg.
Video Explanation: https://youtu.be/ceg2jvHsiJU
Discussion:
85 comments Page 3 of 9.
Abhi said:
8 years ago
Can we simply take 2.5*8 which 20 and add 20 to 65 which is 85?
Abhishek said:
9 years ago
@Marshall.
The mass of 5th person is 77kg.
The mass of 5th person is 77kg.
Lakshmi said:
9 years ago
The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother?
Please explain it with the answer.
Please explain it with the answer.
Marshall said:
9 years ago
The mean mass of 5 men is 78kg, the mass of four of them are 74kg, 76kg, 77kg and 86kg, please what is the mass of the fifth?
Saisangeetha said:
9 years ago
@Bhanu.
Your explanation is good.
Your explanation is good.
Riddhi said:
9 years ago
It's said in question that avg increase by 2.5,
So we can say orginal average maybe X.
X+ 2.5 is avg of 8 people when a new person added instead of a man having 65 kg.
So Wat I meant is deviation is 2.5 or difference 2.5 ( avg b4 a new person was not added )---(Avg after a new person got added).
2.5*8 = 20 kg is the weight that is needed to be disturbed amongst 5 people to get avg of 2.5 so,
20+65 = 85kg.
So we can say orginal average maybe X.
X+ 2.5 is avg of 8 people when a new person added instead of a man having 65 kg.
So Wat I meant is deviation is 2.5 or difference 2.5 ( avg b4 a new person was not added )---(Avg after a new person got added).
2.5*8 = 20 kg is the weight that is needed to be disturbed amongst 5 people to get avg of 2.5 so,
20+65 = 85kg.
Abhishek said:
9 years ago
@Chitti.
Now, pepole is 13.
Avg. inc by 1.
Therefor 40 + 1><13 = 53.
Now, pepole is 13.
Avg. inc by 1.
Therefor 40 + 1><13 = 53.
Rasiga said:
9 years ago
There is very simple formula for this.
Weight of New person = No of Persons * Increased weight + Replaced.
So, 8 * 2.5 + 65 = 85.
Weight of New person = No of Persons * Increased weight + Replaced.
So, 8 * 2.5 + 65 = 85.
Chitti said:
9 years ago
The average age of a group of 12 persons is 40 years. If one more person is included then average increases by 1. What is the age of new person?
M rajoo said:
9 years ago
Thank you @All, for the explanation.
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