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The table above shows the number of pupils in each age group in…

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MATHS

Age in years101112
No. of pupil6277

The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?

  • A. 17/20
  • B. 17/20
  • C. 17/20
  • D. 17/20

QUICK ANSWER…

A

SOLUTION 

The term ‘at least 11 years old’ would mean from 11 years and above.

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Hence, the number of pupils that is at least 11 years old = 27 + 7 = 34

The total number of pupils = 6 + 27 + 7 = 40

Hence, the probability that the pupil randomly chosen will be at least 11 years is = 34/40 = 17/20

Now for the right answer to the above question:

  1. Option A is correct.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is not the correct answer.

QUICK TIPS…

You may please note these/this:

  • Probability is the number of required outcomes divided by number of possible outcomes.
  • “At least 11” simply means 11 and above.

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/ culled from 2018 JAMB-UTME mathematics question 28 /

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