Biology Forums - Study Force

If events A and B are defined on a sample space, with P(A) = 0.25 and P(B  A) = 0.18, then the probability that A and B can both occur at the same time is
 a. 0.250
  b. 0.180
  c. 0.070
  d. 0.045

Q. 2

Which of the following statements is always correct?
 a. P(A and B) = P(A) P(B)
  b. P(A or B) = P(A) + P(B)
  c. P(A or B) = P(A) + P(B) - P(A and B)
  d. P(A) = P(BA)

Q. 3

If P(A) = 0.60, P(B) = 0.63, and P(A and B) = 0.73, then P(A or B) is:
 a. 1.23.
  b. 0.50.
  c. 0.13.
  d. 0.10.

Q. 4

If P(A) = 0.45, P(B) = 0.35 and P(A and B) =0.25, then P(A  B) is:
 a. 1.4.
  b. 1.8.
  c. 0.714.
  d. 0.556.

Q. 5

If P(A) = 0.80, P(B) =0.70 and P(A or B) =0.90, then P(A and B) is:
 a. 0.10.
  b. 0.14.
  c. 0.60.
  d. 0.72.

Q. 6

A sample space is composed of three outcomes, called A, B, and C. Outcome A is twice as probable as B, and B is twice as probable as C. The probabilities of A, B, and C would be:
 a. P(A) = 0.5; P(B) = 0.33; P(C) = 0.167.
  b. P(A) = 0.4; P(B) = 0.4; P(C) = 0.2.
  c. P(A) = 0.57; P(B) = 0.286; P(C) = 0.143.
  d. Insufficient information given to determine answer.

Content hidden