Probability (foundation) Flashcards
State whether each of the following outcome is:
impossible, very unlikely, unlikely, evens, likely, very likely, or certain
a) picking out a heart from a well-shuffled pack of cards
b) Jan 1st 2012 will be on a Sunday
c) Someone in your class is left-handed
d) you will live to be 100
e) A score of 7 is obtained when throwing a dice
f) You will watch some TV this evening
g) A new-born baby will be a girl
a) picking out a heart from a well-shuffled pack of cards - unlikely
b) Jan 1st 2012 will be on a Sunday - certain
c) Someone in your class is left-handed - likely
d) you will live to be 100 - very unlikely
e) A score of 7 is obtained when throwing a dice - impossible
f) You will watch some TV this evening - very likely
g) A new-born baby will be a girl - evens
A bag contains only blue balls. If I take out one at random, what is the probability of each of these outcomes?
a) I get a black ball
b) I get a blue ball
a) I get a black ball - 0
b) I get a blue ball - 1
The numbers 1 to 10 inclusive are placed in a hat. Bob takes a number out of the bag without looking. What is the probability that he draws the following?
a) the number 7
b) an even number
c) a number greater than 6
d) a number less than 3
e) a number between 3 and 8
In a sale at the supermarket, there is a box of ten unlabelled tins. On the side it says: 4 tins of Creamed Rice and 6 tins of Chicken Soup. Mitesh buys this box. When he gets home he wants to have a lunch of chicken soup followed by creamed rice.
a) What is the smallest number of tins he could open to get his lunch?
b) What is the largest number of tins he could open to get his lunch?
c) The first tin he opens is soup. What is the chance that the second tin he opens is
i) soup?
ii) rice?
a) What is the smallest number of tins he could open to get his lunch? - 2
b) What is the largest number of tins he could open to get his lunch? - 7
c) The first tin he opens is soup. What is the chance that the second tin he opens is
i) soup? - 5/9
ii) rice? - 4/9
The diagram shows the outcomes when two dice are thrown together. What is the probability of each of the following?
a) the score is an even ‘double’
b) at least one of the dice shows 2
c) the score on one dice is twice the score on the other dice
d) at least one of the dice shows a multiple of 3
Throwing 2 coins together, there are four equally likely outcomes:
HH HT TH TT
When 2 coins are thrown together, what is the probability of each of these?
a) 2 heads
b) a head and a tail
c) at least one tail
d) no tails
