
Harry has three coins:
One coin is biased so that the probability of obtaining a head when it is thrown is
.
The second coin is biased so that the probability of obtaining a head when it is thrown is
.
The third coin is biased so that the probability of obtaining a head when it is thrown is
.
Harry throws the three coins. The random variable
is the number of heads that he obtains. Draw up the probability distribution table for
.