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Mathematics 1993 JAMB Past Questions

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36
\(\begin{array}{c|c} Class & Frequency\\ \hline 1 - 5 & 2\\6 - 10 & 4\\11 - 15 & 5\\16 - 20 & 2 \\ 21 - 25 & 3\\26 - 30 & 2\\31 - 35 & 1\\36 - 40 & 1 \end{array}\)
Find the median of the observation in the table given
  • A. 11.5
  • B. 12.5
  • C. 14.0
  • D. 14.5
View Answer & Discuss (1) JAMB 1993
37
A number is selected at random between 20 and 30, both numbers inclusive. Find the probability that the number is a prime
  • A. \(\frac{2}{11}\)
  • B. \(\frac{5}{11}\)
  • C. \(\frac{6}{11}\)
  • D. \(\frac{8}{11}\)
View Answer & Discuss (5) JAMB 1993
38
Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13.
  • A. 2
  • B. 4
  • C. 10
  • D. 11
View Answer & Discuss (4) JAMB 1993
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39

The chances of three independent events X, Y, Z occurring are \(\frac{1}{2}\), \(\frac{2}{3}\), \(\frac{1}{4}\) respectively. What are the chances of Y and Z only occurring?

  • A. \(\frac{1}{8}\)
  • B. \(\frac{1}{24}\)
  • C. \(\frac{1}{12}\)
  • D. \(\frac{1}{4}\)
View Answer & Discuss (2) JAMB 1993
40

The shaded portion in the venn diagram is

  • A. x \(\cap\) z
  • B. xo \(\cap\) y \(\cap\) z
  • C. x \(\cap\) yo \(\cap\) z
  • D. x \(\cap\) y \(\cap\) zo
View Answer & Discuss (10) JAMB 1993
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