HARD
Diploma
IMPORTANT
Earn 100

A fair six-sided dice has a "1" on one face a ''2'' on two of its laces and a "3" on the remaining three faces.

The dice is thrown twice, and T is the random variable "the sum of scores from both throws''.

Find the probability that the total score is more than 4.

Important Questions on Valid Comparisons and Informed Decisions: Probability Distributions

HARD
Diploma
IMPORTANT

A board game is played by moving a counter S spaces forward at a time, where S is determined by the following rule:

A fair six-sided dice is thrown once. S half the number shown on the dice if that number is even; otherwise S is twice the number shown on the dice. Write out a table showing the possible value of S and their probabilities.

HARD
Diploma
IMPORTANT

A board game is played by moving a counter S spaces forward at a time, where S is determined by the following rule: A fair six-sided dice is thrown once. S half the number shown on the dice if that number is even; otherwise S is twice the number shown on the dice. Find the probability that, in a single turn, a player moves their counter forward more than 2 spaces.

MEDIUM
Diploma
IMPORTANT

The random variable X has the probability distribution shown.

X 1 2 3 4
P(X=x) 13 13 c c

Find the value of c.

HARD
Diploma
IMPORTANT

The discrete random variable X can take only the values 0, 1, 2, 3, 4, 5. The probability distribution of X is given by the following 

P(X=0)=P(X=1)=P(X= 2) = a

P(X=3)=P(X=4)=P(X= 5) = b

P(X2)=3P(X<2)

where a and b are constants.

Determine the values of a and b.

HARD
Diploma
IMPORTANT

The discrete random variable X can take only the values 0, 1, 2, 3, 4, 5. The probability distribution of X is given by the following 

P(X=0)=P(X=1)=P(X= 2) = a

P(X=3)=P(X=4)=P(X= 5) = b

P(X2)=3P(X<2)

where a and b are constants.

Determine the probability that the sum of two independent observations from this distribution exceeds 7.

HARD
Diploma
IMPORTANT

The discrete random variables A and B are independent and have the following distributions.

a 1 2 3
PA=a 13 13 13
b 1 2 3
PB=b 16 23 16

The random variable C is the sum of one observation from A and one observation from B.

Show that P(C=3)= 518.

HARD
Diploma
IMPORTANT

The discrete random variables A and B are independent and have the following distributions.

a 1 2 3
PA=a 13 13 13
b 1 2 3
PB=b 16 23 16

The random variable C is the sum of one observation from A and one observation from B. Tabulate the probability distribution for C.

MEDIUM
Diploma
IMPORTANT

Complete this probability distribution, in terms of k, for a discrete random variable X

X 1 2 3
PX=x 0.2 1-k  

What range of values can k take? Give your answer in the form akb, a, bQ