WAEC - Mathematics (2004 - No. 35)
What is the probability of selecting a student from the group that scored 2 or 3?
\(\frac{1}{11}\)
\(\frac{5}{22}\)
\(\frac{7}{22}\)
\(\frac{6}{11}\)
ব্যাখ্যা
Prob (2 or 3) = prob(2) + prob(3)
Prob (mark 2) \(=\frac{7}{22}\) + Prob(mark 3) = \(\frac{5}{22}\)
Prob(2 or 3) \(=\frac{7}{22}+\frac{5}{22}=\frac{12}{22}=\frac{6}{11}\)
Prob (mark 2) \(=\frac{7}{22}\) + Prob(mark 3) = \(\frac{5}{22}\)
Prob(2 or 3) \(=\frac{7}{22}+\frac{5}{22}=\frac{12}{22}=\frac{6}{11}\)