Notebooks are printed in three categories i. e small, large and extra-large . They are sold for Rs.95,Rs 105 and Rs.135

[answerhappygod]

Notebooks are printed in three categories i. e small, large and
extra-large . They are sold for Rs.95,Rs 105 and Rs.135
respectively.Thirty percent of the orders are for small, 50 percent
are for large and 20 percent are for the extra large sizes.
Organize the size of the notebooks and the probability of a sale
into a probability distribution.

a) Is this a discrete probability distribution? Justify why or why
not.
b) Compute the mean amount charged.
c) What is the variance in the amount charged?