The table above shows the number of pupils in e... - JAMB Mathematics 2007 Question
A
27/40
B
17/20
C
3/30
D
33/40
correct option: b
P(At east 11 yrs) = P(11yrs) + P(12yrs)
= 27/40 + 7/40
= 34/40
= 17/20
= 27/40 + 7/40
= 34/40
= 17/20
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