What percentage do not use Twitter

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Question - A recent study of online users under age 25 found that 78% use Snapchat, 45% use Twitter and 40% use both. For online users under age 25 answer the following:

(a) What percentage do not use Twitter?

(b) What percentage use at least one of these two social networks?

(c) What percentage use none of these social networks?

(d) What percentage use Twitter but do not use Snapchat (i.e. they use only Twitter?) Hint: Draw a Venn Diagram or set up a 2 × 2 probability table.

(e) If two events are independent then P(A and B) = P(A)´ P(B) Check to see if the two events, Uses Snapchat and Uses Twitter are independent.

(f) If someone uses Snapchat does that change the probability they use Twitter?

Reference no: EM132854390

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