If D ~ N(250,400) find

Question

(a) P(D>265 ∩ D<280)
(b) P(D>265 | D<280)
(c) P(D<242 ∪ D>256)

I calculated (a) to be 0.0149 and (c) to be 0.986, but I'm not sure about (b)

Thanks for any help

Answer 1

Never mind I figured it out