Cutubka 3: Probability, su'aalo iyo jawaabo

Question 1

In the tree diagram for 5 shirts and 3 pairs of pants, how many branches come out of each shirt in the second level?

Accepted Answer

3

Answer

2

Answer

15

Answer

5

Question 2

Which statement about factorials is correct?

Accepted Answer

n! = n(n - 1)!

Answer

n! = (n - 1)! - n

Answer

n! = n + (n - 1)!

Answer

n! = n^(n - 1)

Question 3

Four people each shake hands once with each of the others. Why do we count combinations and not permutations?

Accepted Answer

Because P shaking Q's hand is the same handshake as Q shaking P's hand

Answer

Because there are only 4 people

Answer

Because the handshakes happen in a fixed order

Answer

Because each handshake involves 2 people

Question 4

Which statement defines probability?

Accepted Answer

A numerical value that measures the likelihood of a particular outcome

Answer

A set of outcomes that satisfy a condition

Answer

The number of outcomes of an experiment

Answer

The set of all possible outcomes

Question 5

When two coins are tossed, each outcome consists of

Accepted Answer

two parts, one from each coin

Answer

one part from one coin only

Answer

four parts

Answer

the sum of the two coins

Question 6

For events A and B that are not mutually exclusive, P(A or B) equals

Accepted Answer

P(A) + P(B) - P(A ∩ B)

Answer

P(A) + P(B) + P(A ∩ B)

Answer

P(A) + P(B)

Answer

P(A) x P(B)

Question 7

In a tree diagram, how is the probability of each outcome obtained?

Accepted Answer

By multiplying the probabilities along the relevant branches

Answer

By dividing the first probability by the second

Answer

By adding the probabilities along the branches

Answer

By counting the branches

Question 8

A fair die is tossed and an even number is obtained. What is the probability that the number is greater than or equal to 4?

Accepted Answer

2/3

Answer

1/6

Answer

1/2

Answer

1/3

Cutubka 3: Probability, su'aalo iyo jawaabo

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