It is acceptable to not finish all of a difficult chapter as long as you ask a teacher about it later.

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

1 year ago

In a bag of candy, Marsha found that there were 7 red, 8 blue, 5 yellow, and 9 greens pieces of candy. Marsha put all of the pie

Lunna [17]

Answer:

PART A

Red: 7/29
Blue: 8/29
Yellow: 5/29
Green: 9/29

PART B

Red or blue: 7/29 + 8/29 = 15/29
Yellow or green: 5/29 + 9/29 = 14/29
Blue or yellow or green: 8/29 + 5/29 + 9/29 = 22/29

Explanation:

In this case where the question is asking or <u>OR</u> and the events are <u>mutually exclusive</u> (Mutually exclusive meaning you can't attain two or three different colors in one pick), the compound probability is the sum of the probability of each component event (Probability of Red <u>OR</u> Blue = P(Red) + P(Blue) = 7/29 + 8/29 = 15/29)

8 0

2 years ago

Neurofeedback, a newer type of biofeedback, involves trying to change

frosja888 [35]

Neurofeedback involves trying to change brain wave activity.

<h3>Brain wave</h3>

The human brain is an intricate organ that baffles many scientists today. One design feature of the human brain is its ability to send signals in the form of brain waves when the mind is ar work or in a state of rest. These brain wave activity are braodly categorized into four types, namely;

beta waves
alpha waves
theta waves
delta waves

Neurofeedback thus occurs when an attempt is made to change from one of the above brain wave types to another.

You can learn more about brain wave activity here brainly.com/question/14080098

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8 0

1 year ago