At Least One Probability

A fair coin is flipped three times. What is the probability of seeing heads exactly once?

• 3/8

• 1/8

• 1/2

• 1/6

A fair coin is flipped three times. What is the probability of seeing heads at least once?

• 7/8

• 1/8

• 6/7

• 1/6

Two fair dice are rolled and the numbers that appear are added. What is the probability that this sum is exactly 3?

• 1/12

• 1/18

• 1/4

• 1/6

Let set A = {1, 2, 3, 4} and set B = {2, 3, 5, 7}. One number is chosen at random from each set and their sum is calculated.
What is the probability that this sum is exactly 6?

• 3/16

• 3/8

• 1/16

• 1/4

Let set A = {1, 2, 3, 4} and set B = {2, 3, 5, 7}. One number is chosen at random from each set and their sum is calculated.
What is the probability that this sum is less than 6?

• 5/16

• 3/8

• 5/8

• 1/3

If a fair coin is tossed twice, what is the probability of seeing heads exactly once?

• 3/4

• 1/3

• 1/2

• 2/3

A trial consists of flipping five coins. What is the size of the resulting sample space?

• 5

• 10

• 25

• 32

Consider the dot plot shown. A trial consists of selecting a single student at random from this sample. Let "x" = the number of candy bars this student sold. Find P(x>2) :

• 4/5

• 3/5

• 2/5

• 2/15

Consider the dot plot shown. A trial consists of selecting a single student at random from this sample. Let "x" = the number of candy bars this student sold.

Find P(x=2) :

• 1/15

• 2/15

• 1/8

• 1/4

A bag contains five blue marbles, four yellow marbles and three green marbles.

A trial consists of drawing two marbles from this bag at random and with replacement. Let "b" = number of blue marbles drawn. Find P(b=1).

• 0.2431

• 0.4861

• 0.2652

• 0.5303