STATISTICS - Jamb Mathematics Past Questions and Answers

Question 221:

• JAMB 2002

The mean of a set of six numbers is 60. If the mean of the first five is 50, find the sixth number in the set.

A. 105
B. 100
C. 95
D. 110

Question 222:

• JAMB 2002

Calculate the mean deviation of the set of numbers 7, 3, 14, 9, 7, and 8.

A. 13/6
B. 5/2
C. 7/6
D. 7/3

Question 223:

• JAMB 2002

The venn diagram above shows the numbers of students offering music and history in a class of 80 students. If a student is picked at random from the class, what is the probability that he offers Music only?

A. 0.38
B. 0.13
C. 0.50
D. 0.25

Question 224:

• JAMB 2002

No. of days	1	2	3	4	5	6
No. of students	20	x	50	40	2x	60

The distribution above shows the number of days a group of 260 students were absents from school in a particular term. How many students were absent for at least four days in the term

A. 210
B. 40
C. 120
D. 160

Question 225:

• JAMB 2003

By how much is the mean of 30, 56, 31, 55, 43 and 44 less than the median?

A. 0.75
B. 0.50
C. 0.33
D. 0.17