JAMB Mathematics 2010 Objective — Question 48

Question 48 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2010 Objective paper, with the correct answer and a full explanation.

48. Find the standard deviation of 2, 3, 5 and 6. A. sqrt(2/5) B. sqrt(5/2) C. sqrt6 D. sqrt10

A. sqrt(2/5)
B. sqrt(5/2)Correct
C. sqrt6
D. sqrt10

Explanation

Mean=4. Variance=[(2-4)^2+(3-4)^2+(5-4)^2+(6-4)^2]/4 = 10/4. S.D=sqrt(10/4)=sqrt(5/2).

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