In this exercise, you're required to determine the probability that students who were randomly selected studied for the test, if they pass it with a B or higher grade. Thus, we would apply Bayes's theorem.

Let S represent studied for.

Let B represent a score of B or higher grade

Therefore, we need to find P(S|B):

$S|B = \frac{B|S \times S}{B|S \times S\; +\; B|S' \times S'} \\\\S|B = \frac{0.55 \times 0.6}{0.55 \times 0.6 \;+ \;0.2 \times 0.4}\\\\S|B =\frac{0.33}{0.33 + 0.08} \\\\S|B =\frac{0.33}{0.41}$

S|B = 0.80.

Read more on probability here: brainly.com/question/25870256

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<u>Complete Question:</u>

At the beginning of the semester, a professor tells students that if they study for the tests, then there is a 55% chance they will get a B or higher on the tests. If they do not study, there is a 20% chance that they will get a B or higher on the tests. The professor knows from prior surveys that 60% of students study for the tests. The probabilities are displayed in the tree diagram.

5 0

2 years ago

I need help with these 2 questions

Marta_Voda [28]

Answer:

The first one is D the second one is false.

7 0

3 years ago

Choose the best answer. Which clothing item is worn underneath shoes? el traje los calcetines el vestido la camiseta

choli [55]

Answer:

los calcetines

Explanation:

los calcetines : socks

6 0

2 years ago

Daniel's doctor told him that his stroke was caused by a blood clot in an artery in his brain. What caused Daniel's stroke

REY [17]

Daniel's doctor told him that his stroke was caused by a blood clot in an artery in his brain which means the stroke was caused by a medical condition which is referred to as aneurysm.

<h3>What is Aneurysm?</h3>

This is referred to as a weakened artery rupturing and releasing blood content into the brain. This therefore causes a bulge in the walls of the artery and the major causes of this medical condition include the following:

Atherosclerosis

High blood pressure.

When this happens, the blood forms clot and impairs the function of the central nervous system thereby resulting in the numb sensation or paralysis of certain parts of the body.

The blood formed clots which resulted in the stroke encountered by Daniel in this scenario and therefore makes it the most appropriate choice.

Read more about Aneurysm here brainly.com/question/282530

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6 0

2 years ago