Jamb Mathematics 1984 Past Questions and Answers

Question 31:

• JAMB 1984

The cumulative frequency function of the data below is given below by the equation y = cf(x). What is cf(5)?
\(\begin{array}{c|c} Score(n) & Frequency(f)\\\hline 3 & 30\\ 4 & 32\\ 5 & 30\\ 6 & 35\\8 & 20 \end{array}\)

A. 30
B. 32
C. 55
D. 62
E. 92

Question 32:

• JAMB 1984

A right circular cone has a base radius r cm and a vertical angle 2y^o. The height of the cone is

A. R tan y^o cm
B. R sin y^o cm
C. R cot y^o cm
D. R cos y^o cm
E. R cosec y^o cm

Question 33:

• JAMB 1984

Two fair dice are rolled. What is the probability that both show up the same number of points.

A. \(\frac{1}{36}\)
B. \(\frac{7}{36}\)
C. \(\frac{1}{2}\)
D. \(\frac{1}{3}\)
E. \(\frac{1}{6}\)

Question 34:

• JAMB 1984

The larger value of y for which (y - 1)² = 4y - 7 is

A. 2
B. 4
C. 6
D. 7
E. 8

Question 35:

• JAMB 1984

If sin \(\theta\) = \(\frac{x}{y}\) and 0^o < 90^o then find \(\frac{1}{tan\theta}\)

A. \(\frac{x}{\sqrt{y^2 - x^2}}\)
B. \(\frac{y}{x}\)
C. \(\frac{\sqrt{y^2 + x^2}}{y^2 - x^2}\)
D. \(\frac{y^2 - x^2}{x}\)