You see a woman standing in front of school, now and then stopping students to
ask them questions. She says she is
collecting student opinions for the
newspaper. This is an example of:
A. A convenience sample
B. A self-selected sample
C. A systematic sample
D. A random sample

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.