Percentages errors - Jamb Mathematics Past Questions and Answers

Question 1:

• JAMB 1979

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

A. 1.5
B. 0.8
C. 1.0
D. 1.02
E. 1.05

Question 2:

• JAMB 2019

The weight of a day-old chick was measured to be 0.21g. If the actual weight of the chick is 0.18g, what was the percentage error in the measurement?

A. 15.5%
B. 18.2%
C. 14.8%
D. 16.7%

Question 3:

• JAMB 2019

A factory worker earns #50,000 per month out of which he spends 15% on his children's education, #13,600 on Food, 3% on electricity and uses the rest for his personal purpose. How much does he have left?

A. N21,850
B. N18,780
C. N27,400
D. N32,500

Question 4:

• JAMB 2017

If a rod 10cm in length was measured as 10.5cm, calculate the percentage error

A. 5%
B. 10%
C. 8%
D. 7%

Question 5:

• JAMB 2015

If duty is levied at 25%, find the duty to be added to a bill of N80.

A. N100
B. N20
C. N80
D. N150