A consumer organization inspecting new cars found that many had appearance defects (dents, scratches, paint chips, etc.).

Question:

A consumer organization inspecting new cars found that many had appearance defects (dents, scratches, paint chips, etc.). While none had more than three of these defects, 7% had three, 11% two, and 21% one defect. Find the expected number of appearance defects in a new car and the standard deviation.