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Laabri

Unit 7 Practice/Homework

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1a.

Find P(B).

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1b.

Are A and B independent?

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5a.

A and B are independent.

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5b.

A and B are mutually exclusive.

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6a.

Find the number of teens who prefer vanilla.

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6b.

Find the probability that they are a child who prefers chocolate.

$P(Child \cap Chocolate)$

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6c.

Find the probability that the person is an adult given that they prefer neither flavor.

$P(Adult|Neither)$

Two participants are selected at random.

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7a.

Complete the table.

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10a.

Find the value of p.

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10b.

Find the value of q.

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10c.

A girl is selected at random. Find the probability that she takes economics but not history.

$P(E \cap H')$

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12a.

Find the value of x.

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12b.

Find the value of y.

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12c.

Find the number of employees who, in the last year, did not travel to work by car, bicycle or public transportation.

$n(Neither)$

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15b.

Find the probability that Pablo leaves home before 07:00 and is late for work.
$P(before 7 \cap late)$

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1c.

$P(B\cap A')$

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2a.

Find $P(C \cap D)$

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2b.

Find $P(C \mid D)$

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3a.

$P(A \cap B)$

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3b.

$P(A' \cap B')$

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4a.

Find $P(X \cup Y)$

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4b.

Find $P(X|Y)$

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6d.

Find the probability that one is a teen who prefers vanilla and the other is a child who prefers neither.

$P(TV \cap CN)$

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6e.

Find the probability that both prefer chocolate given that they are adults.

$P(Chocolate|Adult)$

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7b.

A person is selected at random. Find the probability that a child was chosen given that they like to fly kites.

$P(Child|Kites)$

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7c.

A person is selected at random. Find the probability that the person was an adult and likes to jog.
$P(Adult \cap Jog)$

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7d.

Two children are selected at random. Calculate the probability that one likes to fly kites and one likes to picnic.

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8a.

On the Venn diagram shade the region $A' \cap B'$

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8b.

Find $P(A'|B')$

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9a.

Shade the area in the diagram which represents the set $B \cap A'$.

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9b.

Given, $n(U)=100, n(A)=30, n(B)=50, n(A \cup B)=65$, find $n(B \cap A')$.

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9c.

Find $P(B \cap A')$.

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11a.

Complete the Venn diagram for these students.

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11b.

One of the students who joined the sports club was chosen at random. Find the probability that this student joined only the sports club.

$P(S)$

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11c.

Determine whether the events S and M are independent.

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12d.

Find $n((C \cup B) \cap P')$.

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13a.

Complete the tree diagram.

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13b.

Find the probability that exactly one of the selected balls is green.

$P(G)$

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13c.

Find the probability that both balls selected are the same color.

$P(same color)$

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13d.

Find the probability that the first ball is white given that the second ball is green.

$P(W|2G)$

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15a.

Complete the following tree diagram.

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15c.

Find the probability that Pablo is late for work.

$P(late)$

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15d.

Given that Pablo is late for work, find the probability that he left home before 07:00.

$P(before 7|late)$

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15e.

Two days next week Pablo will drive to work. Find the probability that he will be late at least once.

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9d.

Complete the Venn diagram.

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14a.

Find the number of students in the school that are taught in Spanish.

$n(S)$

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14b.

Find the number of students in the school that study Mathematics in English.

$n(M \cap S')$

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14c.

Find the number of students in the school that study both Biology and Math.

$n(B \cap M)$

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14d.

Write down $n(S \cap (M \cup B))$.

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14e.

Write down $n(B \cap M \cap S')$.

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14f.

Find the probability that this student studies Mathematics.

$P(M)$

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14g.

Find the probability that this student studies neither Biology nor Mathematics.

$P(B' \cap M')$

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14h.

Find the probability that this student is taught in Spanish, given that the student studies Biology.

$P(S|B)$

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14i.

Two students are chosen at random. Find the probability that both students take Biology or Spanish.

$P(B \cup S)$

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16a.

State the sampling method being used.

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16b.

Complete the tree diagram.

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16c.

Will not have the disease and will test positive.

$P(no disease \cap test positive)$

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16d.

Will test negative.

$P(test negative)$

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16e.

Has the disease given that they tested negative.
$P(disease|test negative)$

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16f.

The medical center finds the actual number of positive results in their sample is different than predicted by the tree diagram. Explain why this might be the case.

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16g.

Draw a Venn diagram to illustrate this information, placing all relevant information on the diagram.

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16h.

Find the total number of patients who visited the center during this day.

$U$