a computer manufacture discovers through experience a computer manufacture discovers through experience

Question

A computer manufacture discovers through experience that an average of 5 defective hard drives are found in every 100 hard drives manufactured. How many defective hard drives are expected to be found in the productuon of 1040 hard drive?Defective hard drives

Answer 1

To solve problem, first find the percentage of drives that fail.  This is simple because 5 of every 100 fail. which is 5/100.  A percentage can be expressed as a number over 100

5 of 100 or 5% of all drives fail

multiply this 5% by the 1040 drives to find out how many of the 1040 drives fail.

convert the percentage to a decimal by moving the decimal point two places to the left to get .05 times 1040

52 of the 1040 drives will fail.