Measures of Dispersion - Jamb Mathematics Past Questions and Answers

Question 21:

• JAMB 1997

Find the difference between the range and the variance of the following set of numbers 4, 9, 6, 3, 2, 8, 10, 5, 6, 7 where \(\sum d^2\) = 60

A. 2
B. 3
C. 4
D. 6

Question 22:

• JAMB 1997

Find the standard derivation of the following data -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5

A. 2
B. 3
C. \(\sqrt{10}\)
D. \(\sqrt{11}\)

Question 23:

• 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 24:

• 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

Question 25:

• JAMB 2000

If the mean of the numbers 0, (x+2), (3x+6), and (4x+8) is 4, find their mean deviation.

B. 2
C. 3
D. 4