A pet store contains 30 light green parakeets (14 females and 16 males)
and 47 sky blue parakeets (25 females
and 22 males). You randomly choose
one of the parakeets. What is the
probability that it is a female or a sky
blue parakeet?

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample