Dependent/Independent and Mutually Exclusive/Inclusive Events

A die is rolled.  What is the probability of rolling a 5 or a number greater than 3?

• 2/3
• 1/2
• 5/6
• 1

Which formula do you use when two events are mutually exclusive?

• P(A or B) = P(A) + P(B)
• P(A or B) = P(A) + P(B) - P(both)
• P(A and B) = P(A) * P(B)
• P (A and B) = P(A) * P(B|A)

Which formula do you use when two events are NOT mutually exclusive?

• P(A or B) = P(A) + P(B)

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

• P(A and B) = P(A) * P(B)

• P (A and B) = P(A) * P(B|A)

If you draw one card from a standard deck, what is the probability of drawing a 5 or a diamond?

• 2/52
• 4/52
• 16/52
• 26/52

The enrollment at Southburg High School is 1400.  Suppose 550 students take French, 700 take algebra, and 400 take both French and algebra.  What is the probability that a student selected randomly takes French or algebra?

• 1250/1400
• 700/1400
• 550/1400
• 17/28

Edith plants a daffodil bulb. The probability that the bulb will grow is 0.8.

What is the probability that the bulb will not grow?

• 0.8

• 0.2

• 0.4

• 0.6

Two events are mutually exclusive if:

• they cannot happen at the same time
• they can happen at the same time
• they always happen 
• they never happen 

The complement of rolling a 3 is:

• Rolling an odd number

• Not rolling a 3

• Rolling an even number

The outcome of one event does influence the outcome of the other event

• mutually exclusive event
• probability
• dependent event
• simple probability

The outcome of one event does not influence the outcome of the other event

• independent event
• tree diagram
• simple event
• odds