Question

An injection-molded part is likely to be obtained from any one of 9 cavities on a mold. round your answers to three decimal places.

b.what is the probability that a part is from cavity 1, 2, or 3?
c.what is the probability that a part is from neither cavity 3 nor 4?

Answer 1

Probability of it being from 1, 2 or 3 is 3(1/9) = 1/3
Probability of it not being from 3 nor 4, is 1-2(1/9) = 7/9