P (A) = 0.50, P (B) = 0.40, and P (A and B) = 0.15 what is P (A or B) ?

0.75

Step-by-step explanation:

P (A) + P (B) - P (A and B) = P (A or B)

0.5 + 0.4 - 0.15 = 0.75

(I also just took this question on APEX)

P (A or B) = 0.90.

This is a problem of probability called separate event P (A or B), those events that given the occurrence of one prevents the occurrence of the other

P (A or B) = P (A) + P (B)

Give P (A) = 0.50 and P (B) = 0.40. Calculate P (A or B):

P (A or B) = 0.50 + 0.40

P (A or B) = 0.90