Question 854776
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Hi,
Think it is easier to view data like this:
type	EASY	DIFF	T
Music	0.2	0.15	0.35
Sport	0.2	0.1	0.3
History	0.1	0.05	0.15
Nature	0.15	0.05	0.2
Total     .65             .35       1.00
(A)I am going to take one card at random from the box.
 What is the probability that it will be:
 A HISTORY QUESTION?
 Is the answer 0.15 
 AN EASY QUESTION?
 Is the answer 0.65 
 (B)There are 40 cards in the box.
 How many of these are MUSIC questions  {{{.35*40 = 14}}}