A Lights-A-Lot quality inspector examines a sample of 25 strings of lights and finds that 6 are defective.

Question

a. What is the experimental probability that a string of lights is defective?
b. What is the best prediction of the number of defective strings of lights in a delivery of 1,000 strings of lights?

Answer 1

3/500; 6 lights
6/25; 24 lights
1/40; 25 lights
6/25; 240 lights

Answer 2

I really need help. Fast.