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4.4 Probability (A-level only)

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Question 80

A boutique coffee house tracks the monthly habits of its 120 loyalty card holders. The frequency of their visits and their preferred beverage type are summarized in the table below.

Monthly visits, vvvEspresso-basedFilter coffee
v<10v < 10v<101832
10≤v<2010 \le v < 2010≤v<202218
v≥20v \ge 20v≥201416

One of the 120 members is selected at random.

a.

Find the probability that the member prefers Filter coffee.

[1]
b.

Given that the member visits fewer than 10 times a month, find the probability that this member prefers Espresso-based drinks.

[2]
c.

Given that the member visits fewer than 20 times a month, find the probability that this member prefers Espresso-based drinks.

[2]
d.

State, with a reason, whether or not the event 'prefers Espresso-based drinks' is independent of the event 'visits fewer than 10 times a month'.

[2]

4.4 Probability (A-level only) Questions

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