2 Answers

Kappe · Answer 1 · 2020-09-11T20:41:52+0000

Answer:

Hence, the probability that a randomly selected reference book is a hardcover is:

0.4

Let A denote the event that the book selected is a reference book.

and B denote the event that the book is hardcover.

Let P denote the probability of an event.

We are asked to find:

P(B|A)

We know that:

$P(B|A)=(P(A\bigcap B))/(P(A))$

From the table we have:

P(A)=(25)/(60)=(5)/(12)

and

$P(A\bigcap B)=(10)/(60)=(1)/(6)$

Hence, we have:

$P(B|A)=((1)/(6))/((5)/(12))\\\\\\P(B|A)=(2)/(5)\\\\\\P(B|A)=0.4$

Hence, the answer is:

0.4

Naeg · Answer 2 · 2020-09-17T18:46:17+0000

Answer:

B. 0.4

Explanation:

Use the definition of the probability

$Pr=\frac{\text{Number of all favorable outcomes}}{\text{Number of all possible outcomes}}$

You have to find the probability that a randomly selected reference book is hard cover. Hence, from the table

So, the probability is

Pr=(10)/(25)=(40)/(100)=0.4