The table above shows the number of pupils in e... - JAMB Mathematics 2007 Question

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 1 years old?

A

²⁷/₄₀

B

¹⁷/₂₀

C

³/₃₀

D

³³/₄₀

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Correct Option: B

P(At east 11 yrs) = P(11yrs) + P(12yrs)

= ²⁷/₄₀ + ⁷/₄₀

= ³⁴/₄₀

= ¹⁷/₂₀

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