STATISTICS - Jamb Mathematics Past Questions and Answers

Question 81:

• JAMB 1979

The following table relates the number of objects f corresponding to a certain size x. What is the average size of an object?
\(\begin{array}{c|c} f & 1 & 2 & 3 & 4 & 5 \\ \hline x & 1 & 2 & 4 & 8 & 16\end{array}\)

A. \(\frac{31}{15}\)
B. \(\frac{31}{5}\)
C. \(\frac{129}{5}\)
D. \(\frac{43}{5}\)
E. \(\frac{16}{5}\)

Question 82:

• JAMB 1980

The median of the set of numbers 4, 9, 4, 13, 7, 14, 10, 17 is

A. 13
B. 7
C. \(\frac{19}{2}\)
D. \(\frac{39}{4}\)
E. 10

Question 83:

• JAMB 1980

In a school, there are 35 students in class 2A and 40 in class 2B. The mean score for class 2 in an English Literature examination is 60.0 and that for 2B in the same paper is 52.5. Find, to one place of decimal, the mean for the combined classes

A. 2.5
B. 56.0
C. 56.2
D. 56.3
E. 6.5

Question 84:

• JAMB 1980

A set of data contains a total of 130 items which are divided into six groups for display on a pie chart. If one group contains 26 items, then the sector representing this group on the pie chart contains an angle x^o at the centre of the circle where x is

A. 36^o
B. 60^o
C. 70^o
D. 72^o
E. 75^o

Question 85:

• JAMB 1981

A group of 14 children children received the following scores in a reading test: 35, 35, 26, 26, 26, 29, 29, 29, 12, 25, 25, 25, 25, 17. What was the median score?

A. 29
B. 26
C. 24
D. 25
E. 23