If we say that rare events are those events that happen with a probability of less than .05, then how many observations of men taller than 71 inches tall would you have to observe when randomly sampling before concluding that you had a rare sample?

Question

If we say that rare events are those events that happen with a probability of less than .05, then how many observations of men taller than 71 inches tall would you have to observe when randomly sampling before concluding that you had a rare sample?
mean = 69, SD = 4

Reiny · Answer

This is a great webpage for this type of question http://davidmlane.com/hyperstat/z_table.html