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NDA 2014
Exam
NDA
Year
2014
Subject
Mathematics
Chapter
Statistics

NDA 2014 · Mathematics · Statistics

p, q, r, s, t are five numbers such that the average of p , q and r...

p,q,r,s,tp, q, r, s, t are five numbers such that the average of pp, qq and rr is 5 and that of ss and tt is 10. What is the average of all the five numbers?

Options

  1. A7.75
  2. B7.5
  3. C7
  4. D5

Correct answer

C. 7

Step-by-step solution

There are 5 numbers as p,q,r,sp, q, r, s and tt. Sum of three numbers as (p+q+r)=5×3=15(p+q+r)=5 \times 3=15 Sum of ss and tt numbers =10×2=20=10 \times 2=20 Sum of all 5 numbers =15+20=35=15+20=35 Average of these numbers =355=7=\frac{35}{5}=7.
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