PROBABILITY

Question

50 percent????

 

 

what is the probability of getting at least one tails in 2 consecutive tosses? 

 

what is the probability of getting either a queen or any black card in a one draw? 

Answer 1

if you toss a coin twice this is the sample space:

HH

TT

HT

TH

tails comes up 3 out of 4 times

P=3/4

 

there are 4 queens and 13 black cards but 2 of the queens are black and you can't count them twice

13 (black cards, including queen of clubs and queen of spades)+2 (queens, queen of hearts and queen of diamonds)

(13+2)/52

P=15/52

or 13 black cards + 4 queens - 1 queen of spades - 1 queen of clubs=15 out of 52 cards