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1 of 8 0-day streak

Venn diagrams, two-way tables and set notation for two events

DIFFICULTYintrostandardchallenge
QUESTION TYPEMix of allChange
read venn: A only countread venn: A only probabilityread venn: B only countread venn: B only probabilityread venn: both countread venn: both probabilityread venn: neither countread venn: neither probabilityread venn: union countread venn: union probabilityNOWMix of allRecommended
Question 1 of 8

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A group of files is classified by two properties

Let \(A\) be the set of digital files, and let \(B\) be the set of portable files

The universe \(S\) contains 22 items. Each item is equally likely to be selected when a probability is requested

The Venn diagram shows the count in each disjoint region

Venn diagram in universe S with set A for digital items and set B for portable items. A-only region is labelled 9; B-only region is labelled 5; shared region is labelled 4; region outside both sets is labelled 4.Sdigitalportable9544
1 mark

Read the diagram and give the count of items in B only

Format: whole number