Question

The table shows the performance of a selection of 100 stocks after one year. (Take S to be the set of all stocks represented in the table. If a stock stayed within 20% of its original value, it is classified as "unchanged".)

	Companies			Total
	Pharmaceutical P	Electronic E	Internet I
Increased V	12	12	18	42
Unchanged N	11	3	3	17
Decreased D	2	3	12	17
Total	25	18	33	76

Use symbols to describe the event that an Internet stock did not increase.

I ∩ VI ∪ V'     I ∪ VI' ∩ VI ∩ V'

How many elements are in this event?

Answer 1

Answer:

	Companies	Total
Pharmaceutical P	Electronic E	Internet I
Increased V	12	12	18	42
Unchanged N	11	3	3	17
Decreased D	2	3	12	17
Total	25	18	33	76

I ∩ V ' describe the event that an Internet stock did not increase.

number of elements in the event = 3+12

number of elements in the event = 15

please comment if you have any doubt

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