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Mathematics JAMB Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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801

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
802

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

  • A. 3.2
  • B. 3.3
  • C. 3.7
  • D. 4.2
View Answer & Discuss (8) JAMB 1995
803
\(\begin{array}{c|c} \text{Class Interval} & Frequency & \text{Class boundaries} & Class Mid-point \\ \hline 1.5 - 1.9 & 2 & 1.45 - 1.95 & 1.7\\ 2.0 - 2.4 & 21 & 1.95 - 2.45 & 2.2\\ 2.5 - 2.9 & 4 & 2.45 - 2.95 & 2.7 \\ 3.0 - 2.9 & 15 & 2.95 - 3.45 & 3.2\\ 3.5 - 3.9 & 10 & 3.45 - 3.95 & 3.7\\ 4.0 - 4.4 & 5 & 3.95 - 4.45 & 4.2\\ 4.5 - 4.9 & 3 & 4.45 - 4.95 & 4.7\end{array}\)
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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804
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
805

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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