Question

AMZ Supergloves Co produces rubber gloves for export market. In one of the recent quality testing, 200 rubber gloves were subjected to 7,000 hours of testing. After 3,000 hours, 10 of the gloves tore apart. The remaining gloves remain intact until the 7,000th hours. a) Calculate the number of failure per unit year.

b) If 2,000 rubber gloves are to be used by customers next year, how many units can we expect to fail?

Answer 1

Failure rate % = (Nubmer of failures / Number of units tested) x 100 %

Failure rate (number) = Nubmer of failures / operating time

Operating time = total time - non-operating time

Mean time between failures, MTBF = 1/ failure rate (number)

 

a. Failure rate per unit year is 0.644118.

b. Units expected to fail out of 2000 is 128.82.

a. Failure rate per unit year is 0.644118.

b. Units expected to fail out of 2000 is 128.82.