Percentages errors - Jamb Mathematics Past Questions and Answers

Question 6:

• JAMB 1980

A man and his wife went to buy an article costing N400. The woman had 10% of the cost and the man 40% of the remainder. How much did they have altogether?

A. N216
B. N200
C. N184
D. N144
E. N100

Question 7:

• JAMB 1982

The diameter of a metal rod is measured as 23.40 cm to four significant figures. What is the maximum error in the measurement?

A. 0.05cm
B. 0.5cm
C. 0.045cm
D. 0.005cm
E. 0.004cm

Question 8:

• JAMB 1983

Correct each of the numbers 59.81798 and 0.0746829 to three significant figures and multiply them, giving your answer to three significant figures

A. 4.46
B. 4.48
C. 4.47
D. 4.49
E. 4.50

Question 9:

• JAMB 1983

If a rod of length 250cm is measured as 255cm long in error, what is the percentage error in the measurement?

A. 55
B. 10
C. 5
D. 4
E. 2

Question 10:

• JAMB 1988

A 5.0g of salt was weighted by Tunde as 5.1g. What is the percentage error?

A. 20
B. 2
C. 1.1
D. 0.2