Standard deviation - Jamb Mathematics Past Questions and Answers

Question 6:

• 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. \(\sqrt{5}\)

Question 7:

• 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. \(\sqrt{5}\)

Question 8:

• 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 9:

• 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 10:

• JAMB 2005

Find the value of t if the standard deviation of 2t, 3t, 4t, 5t, and 6t is √2

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