Question

On the ninth day of Statistics, my teacher gave to me --- nine ladies dancing. These nine ladies dancing are the backup dancers for In Sync. It is well known that if dancers don’t warm up adequately before dancing, the dancers will be Out of Sync and may sustain injuries. Of the nine ladies, 1 warmed up and had injuries, 1 failed to warm up and did not have injuries, 5 warmed up and had no injuries and 2 failed to warm up and had injuries,. What is the probability that a randomly selected dancer would have injuries or would have failed to warm up?

Answer 1

9 dancers total
5 warmed and had no injuries (W & ~I)

You want ~W or I = ~(W & ~I)
So, your probability is 1 - 5/9 = 4/9

Answer 2

Thanks