Average Questions & Answers with Solutions

Average Problems- Aptitude, questions and Answers Mock test. Welcome to freeonlinetest online exam portal, here you will get 20+ Average questions with Answers.

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Average Questions & Answers with Solutions 

Question-1)

The average of 15 numbers is 7. If the average of the first 8 numbers is 6.5 and the average of the last 8 numbers is 8.5, then the middle number is 

Answer & Solutions

Middle i.e. eighth number

= 8 × 6.5 + 8 × 8.5 – 15 × 7

= 52 + 68 – 105

= 120 – 105 = 15

Question-2)

The average of 11 results is 50. If the average of the first six results is 49 and that of the last six is 52, the sixth no. is

Answer & Solutions

Average of two or more numbers/quantities is called the mean of these numbers, which is given by

$\text"Average(A)" = \text"Sum of observation / quantities"/\text"No of observation / quantities"$

∴ S = A × n

Sixth result

= 6 × 49 + 6 × 52 – 11 × 50

= 294 + 312 – 550 = 56

Question-3)

The average of 8 numbers is 21. If each of the numbers is mulitiplied by 8, the average of the new set of numbers will be

Answer & Solutions

When each number is multiplied by 8, the new average gets multiplied by 8. i.e., 21 × 8 = 168

Question-4)

The average of the largest and smallest 3 digit numbers formed by 0, 2 and 4 would be

Answer & Solutions

Largest 3–digit number formed by 0, 2 and 4 = 420 Smallest number of three digits = 204

∴ Required average

= ${420+204}/2$ = $624/2$ = 312

Question-5)

What is the average of first five multiples of 12?

Answer & Solutions

Average = 12×(1+2+3+4+5) × $1/5 $

= 12 ×15 × $1/5 $

= 12 × 3= 36

Test instructions :

  • Total number of questions : 20
  • Each question carries 1 mark
  • Negative marks of Each Questions: 0.25
  • Skiping questions No marks will deduct.
  • Time allotted : 30 minutes