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Mathematics 1995 JAMB Past Questions

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36

The variance of the scores 1, 2, 3, 4, 5 is

  • A. 1, 2
  • B. 1, 4
  • C. 2.0
  • D. 3.0
View Answer & Discuss (2) JAMB 1995
37

\(\begin{array}{c|c} \text{Class Interval} & Frequency & \text{Class boundaries} & Class Mid-point \\ \hline 1.5 - 1.9 & 2 & 1.45 - 1.95 & 1.7\\ 2.0 - 2.4 & 1 & 1.95 - 2.45 & 2.2\\ 2.5 - 2.9 & 4 & 2.45 - 2.95 & 2.7 \\ 3.0 - 2.9 & 15 & 2.95 - 3.45 & 3.2\\ 3.5 - 3.9 & 10 & 3.45 - 3.95 & 3.7\\ 4.0 - 4.4 & 5 & 3.95 - 4.45 & 4.2\\ 4.5 - 4.9 & 3 & 4.45 - 4.95 & 4.7\end{array}\)
Find the mode of the distribution.

  • A. 3.2
  • B. 3.3
  • C. 3.7
  • D. 4.2
View Answer & Discuss (8) JAMB 1995
38
\(\begin{array}{c|c} \text{Class Interval} & Frequency & \text{Class boundaries} & Class Mid-point \\ \hline 1.5 - 1.9 & 2 & 1.45 - 1.95 & 1.7\\ 2.0 - 2.4 & 21 & 1.95 - 2.45 & 2.2\\ 2.5 - 2.9 & 4 & 2.45 - 2.95 & 2.7 \\ 3.0 - 2.9 & 15 & 2.95 - 3.45 & 3.2\\ 3.5 - 3.9 & 10 & 3.45 - 3.95 & 3.7\\ 4.0 - 4.4 & 5 & 3.95 - 4.45 & 4.2\\ 4.5 - 4.9 & 3 & 4.45 - 4.95 & 4.7\end{array}\)
The median of the distribution above is
  • A. 4.0
  • B. 3.4
  • C. 3.2
  • D. 3.0
View Answer & Discuss (1) JAMB 1995
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39
Let p be a probability function on set S, where S = (a1, a2, a3, a4). Find P(a1) if P(a2) = \(\frac{1}{3}\), p(a3) = \(\frac{1}{6}\) and p(a4) = \(\frac{1}{5}\)
  • A. \(\frac{7}{3}\)
  • B. \(\frac{2}{3}\)
  • C. \(\frac{1}{3}\)
  • D. \(\frac{3}{10}\)
View Answer & Discuss (10) JAMB 1995
40

A die has four of it's faces coloured white and the remaining two coloured black. What is the probability that when the die is thrown two consecutive time, the top face will be white in both cases?

  • A. \(\frac{5}{3}\)
  • B. \(\frac{1}{9}\)
  • C. \(\frac{4}{9}\)
  • D. \(\frac{1}{36}\)
View Answer & Discuss (4) JAMB 1995
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