Question

In a sample of 7500 new iphones, 18 were found to be defective. at this rate, how many defective iphones would be expected in a sample of 60000 new iphones? use a proportion to set up and solve this problem. write a complete answer including units

Answer 1

In 7500 iPhones, 18 were found defective. 
18 of 7500 is 0.24%
0.24% of iPhones were defective.

Using the information above:
In a sample of 60000 new iPhones, 144 would be found defective.
144 of 60000 is 0.24%

Answer: 144 defective iPhones would be expected in a sample of 60,000.

Hope this helps! Good luck. :-)