Jamb Mathematics Past Questions For Year 1992
Question 36
\(\begin{array}{c|c} x & 2 & 4 & 6 & 8\\ \hline f & 4 & y & 6 & 5 \end{array}\)
If the mean of the above frequency distribution is 5.2, find y
- A. 2, 1
- B. 1, 2
- C. 1, 5
- D. 5, 2
Question 37
\(\begin{array}{c|c} \text{No. of children} & 0 & 1 & 2 & 3 & 4 & 5 & 6 \\ \hline \text{No. of families} & 7 & 11 & 6 & 7 & 7 & 5 & 3 \end{array}\)
Find the mode and median respectively of the distribution above
- A. 2, 1
- B. 1, 2
- C. 1, 5
- D. 5, 2
Question 38
If the scores of 3 students in a test are 5, 6 and 7, find the standard deviation of their scores
- A. \(\frac{2}{3}\)
- B. \(\frac{2}{3}\sqrt{3}\)
- C. \(\sqrt{\frac{2}{3}}\)
- D. \(\sqrt{\frac{3}{2}}\)
Question 39
Two perfect dice are thrown together, Determine the probability of obtaining a total score of 8
- A. \(\frac{1}{12}\)
- B. \(\frac{5}{36}\)
- C. \(\frac{1}{6}\)
- D. \(\frac{7}{36}\)
Question 40
The probability of an event P is \(\frac{3}{4}\) while that of another event Q is \(\frac{1}{6}\). If the probability of both P and Q is \(\frac{1}{2}\). What is the probability of either P or Q.
- A. \(\frac{1}{96}\)
- B. \(\frac{1}{8}\)
- C. \(\frac{5}{6}\)
- D. \(\frac{11}{12}\)
