In Order to Prevent Faulty Product from Reaching the Consumer

In order to prevent faulty product from reaching the consumer, a large computer chip manufacturer tests chips for 1,000 hours of operating time. For a typical mean-life test, 10 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 showed he dame defect within the first few hours (50, 100, and 200 hours). The other chips completed the test. Calculate the mean-life of this production lot of chips.