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Playing With Numbers — MATHS STD 6 — Question

Gujarat BoardEnglish MediumSTD 6MATHSPlaying With Numbers1 Mark
MCQ
The average of the first nine prime numbers is:
  • A
    $9$
  • B
    $11$
  • ✓
    $11\frac{1}{9}$
  • D
    $11\frac{2}{9}$
✓

Answer

Correct option: C.
$11\frac{1}{9}$
first nine prime numbers : $2, 3, 5, 7, 11, 13, 17, 19, 23$
average = sum of numbers / total numbers
$=\frac{2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23}{9}$
$=\frac{100}{9}$
$=11\frac{1}{9}$

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