STATISTICS - Jamb Mathematics Past Questions and Answers

Question 171:

• JAMB 1995

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. \(\frac{3}{10}\)

Question 172:

• JAMB 1995

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. \(\frac{2}{3}\)
B. \(\frac{1}{9}\)
C. \(\frac{4}{9}\)
D. \(\frac{1}{36}\)

Question 173:

• JAMB 1995

\(\begin{array}{c|c} \text{Age in years} & 13 & 14 & 15 & 16 & 17 \\ \hline \text{No. of students} & 3 & 10 & 30 & 42 & 15\end{array}\)
The frequency distribution above shows the ages of students in a secondary school. In a pie chart constructed to represent the data, the angles corresponding to the 15 years old is

A. 27^o
B. 30^o
C. 54^o
D. 108^o

Question 174:

• JAMB 1995

The pie chart shows the distribution of students in a secondary school class. If 30 students offered French, how many offered C.R.K?

A. 25
B. 15
C. 10
D. 8

Question 175:

• JAMB 1995

\(\begin{array}{c|c} class& 1 - 3 & 4 - 6 & 7 - 9\\ \hline Frequency & 5 & 8 & 5\end{array}\)
Find the standard deviation of the data using the table above

A. 5
B. \(\sqrt{60}\)
C. \(\frac{5}{3}\)
D. \(\sqrt{5}\)