STATISTICS - Jamb Mathematics Past Questions and Answers

Question 186:

• JAMB 1997

The pie chart shows the income of a civil servant in a month. If his monthly income is N600, find his monthly basic salary

A. N2000
B. N2600
C. N3100
D. N3450

Question 187:

• JAMB 1998

If m and n are the mean and median respectively of the set of numbers 2, 3, 9, 7, 6, 7, 8, 5, find m + 2n to the nearest whole number

A. 19
B. 18
C. 13
D. 12

Question 188:

• JAMB 1998

\(\begin{array}{c|c} \text{Average hourly earnings(N)} & 5 - 9 & 10 - 14 & 15 - 19 & 20 - 24\\ \hline \text{No. of workers} & 17 & 32 & 25 & 24\end{array}\)
Estimate the mode of the above frequency distribution

A. 12.2
B. 12.27
C. 12.9
D. 13.4

Question 189:

• JAMB 1998

Find the variance of the numbers k, k+1, k+2,

A. \(\frac{2}{3}\)
B. 1
C. K + 1
D. (k + 1)²

Question 190:

• JAMB 1998

Find the positive value of x if the standard deviation of the numbers 1, x + 1 is 6

A. 1
B. 2
C. 3
D. 4