In order to prevent faulty product from reaching the consume

In order to prevent faulty product from reaching the consumer, a large computer chip manufacturer tests the chips for 1,000 hours of operating time. For a typical mean-life test, ten chips are selected at random from the daily production and submitted to the 1,000 hour life test. For this particular batch of 10 chips, three of the 10 chips showed the same defect within the first few hours (50 hours, 100 hours, and 200 hours). The other chips completed the test without incident. Calculate the mean life of this production lot of chips.

Solution

1ST 3 WENT IN 50 ,100.200 HOURS

AND REST 7 WENT FOR 1000 HOURS

SO TOTAL SUM = 7*1000+50+100+200 = 7350

HENCE MEAN LIFE = 7350/10 = 735