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Aswin M

· started a discussion

· 1 Months ago

average (Question: 128780.0 )

in that sum they given only 9 members average.how you take as 10 person average

Question:
If the average weight of 6 students is 50 kg, that of 2 students is 51 kg; and that of 2 students is 55 kg, then the average weight of all ten students is:
Options:
A) 61kg 
B) 51.5kg 
C) 52 kg 
D) 51.2 kg 
E) None of these
Solution:
Ans: (d) Total weight of 10 students

= 6 × 50 + 2 × 51 + 2 × 55

Average weight of 10 students
\(=\cfrac{Total\ \ weight\ \ of \ \ 10\ \ students}{10}\)
\(= 300 + 102 + 110 = \cfrac{512}{10} = 51.2\)

Knowledge Expert

· commented

· 1 Months ago

@Anjuman Tiwari Good :)

Anjuman Tiwari

· commented

· 1 Months ago

total there are 6 students then 2 -2 more.. hence sum up to 10 students.. its quite simple
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