Apple manufactures iphones and checks some iphones for defects. Within the first five minutes of a work shift, an iphone is randomly selected from the completed iphones, and checked for defects. For the rest of the shift, every 10th iphone is checked for defects. On one shift, it is found that 300 out of 2,000 iphones have defects.
a. Based on these results, what is the probability of an iphone manufactured by the company being defective?
b. Estimate how many iphones out of 3,000 manufactured can be expected to be defective. What if 5,000 were manufactured?
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