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The result of tossing a fair die 120 times is summarized below. Find the value...

Mathematics
JAMB 2003

The result of tossing a fair die 120 times is summarized below. Find the value of x

Number 1 2 3 4 5 6
Frequency 12 20 x 21 x - 1 28

 

  • A. 19
  • B. 20
  • C. 21
  • D. 22
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Correct Answer: Option B
Explanation

12 + 20 + x + 21 + x-1 +28 = 120
2x + 80 = 120
2x = 120 - 80
2x = 40
x = 20

There is an explanation video available below.

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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post UTME Past Questions Agent
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076