. This means that only 300 bulbs lasted less than 1,500 hours.
To calculate the percentage of bulbs that burnt out after more than 1,500 hours, we can use the following formula:
(2200/2500) * 100 = 88%
Therefore, Company X's light bulbs have an 88% success rate in lasting more than 1,500 hours of use.
Company x tested its light bulbs to see how long they would last. On a production line 2,500 bulbs were taken and tested. The department in charge reported that out of 2,500 there were 2,200 bulbs that burnt out after more than 1,500 hours of use
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