If A and B are mutually exclusive events with P(A) = 0.3 andP(B) = 0.5, then P(A ? B) =

a. 0.00

b. 0.15

c. 0.2

d. 0.8

An experiment consists of four outcomes with P(E₁) =0.2, P(E₂) = 0.3, and P(E₃) = 0.4. Theprobability of outcome E₄ is

a. 0.024

b. 0.100

c. 0.900

d. 0.500

If A and B are mutually exclusive events with P(A) = 0.3 andP(B) = 0.5, then P(A ? B) =

a. 0.20

b. 0.30

c. 0.15

d. 0.00

The empirical rule states that, for data having a bell-shapeddistribution, the percentage of data values being within onestandard deviation of the mean is approximately

a. 50

b. 95

c. 68

d. 33

If a penny is tossed four times and comes up heads all fourtimes, the probability of heads on the fifth trial is

a. larger than the probability of tails

b. 1/32

c. 0.5

d. zero