I'm a late learner of maths &science.
Any books discuss these kind of problems?
3 groups of data:
f g h are their frequencies.
mean:
variance:
Find the mean and variance of
T can be many different operations.
for example:
T may be:
T may be:
T may be:
T may be:
T may be: , mean of two elements drawn from with replacement i=j is allowed.
T may be: , two elements drawn from without replacement where .
T may be: [????I don't know how it looks like.] is
T may be: , three elements drawn from without replacement where .
T may be: , a b c elements drawn from respectively with replacement.
T may be: [????I don't know how it looks like.], a b c elements drawn from respectively without replacement. I can't figure out the combination]