07 Random Variables

A random variable is defined by a rule that assigns a _______________ to every outcome in a sample space.

• number

• letter

• Event

• probability

Tags

CCSS.HSS.MD.A.1

Two fair dice are rolled and the numbers that appear are added. What is the probability that this sum is at least 5?

• 5/12

• 5/36

• 5/6

• 1/6

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

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

• 3/8

• 1/8

• 1/2

• 1/6

Tags

CCSS.HSS.CP.A.1

CCSS.HSS.CP.B.9

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

Tags

CCSS.HSS.CP.A.1

CCSS.HSS.CP.B.7

The Sum Rule states that the sum of the probabilities of all instances of a random variables equals...

• 1

• 0

• P(E)

• P(E')

Tags

CCSS.HSS.CP.B.7

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

Tags

CCSS.HSS.CP.A.1

A couple has four children. Let "b" = the number of boys they have. What are the possible instances of "b"?

• {0, 1, 2, 3, 4}

• {1, 2, 3, 4}

• {boy, girl}

• {0, 1, 2, ..... 16}

Tags

CCSS.HSS.CP.A.1

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

Tags

CCSS.HSS.CP.A.1

CCSS.HSS.CP.B.7

CCSS.HSS.CP.B.9

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

Tags

CCSS.HSS.CP.A.1

CCSS.HSS.CP.B.9

The set of all outcomes assigned a given number, or that number itself, is called a/an __________________ of a random variable

• instance

• outcome

• result

• sum

Tags

CCSS.HSS.MD.A.1

CCSS.HSS.MD.A.3

CCSS.HSS.MD.A.4