a study examined the effectiveness of an ear molding technique used to correct ear deformities in newborns without the need for
surgery. a plastic mold was placed around the deformed ear shortly after birth for about 2 weeks. the study reports that 152 of 158 procedures were successful. what is the sample proportion of successful procedures
We know that they have: 2 entrences 3 ways to chose (escalator,elevator and stairs) 8 gates and again 3 ways to chose (escalator, elevator and stairway)
now you have to multiply it:
There are 144 different ways that Anita and Terry can go from street level to the trains:)