Question

A teacher has found that the probability that a student studies for a test is 60%, the probability that a student gets a good grade on a test is 70%, and the probability that both events occur is 52%. The teacher randomly finds a test with a good grade on it. Find the probability that the student did not study for the test. Round to three decimals.

Answer #1

TOPIC:Events and probability.

a student takes a multiple choice test that has 30 questions.
each question has 5 choices. the student did not study for the test
and decides to randomly guess at each question. a) find the
probability the student gets exactly 10 problems correct. b)
calculate the mean. c) calculate the standard deviation. statistics
and probability.

a) At The Fencing Center, 60% of the fencers use the foil as
their main weapon. We randomly survey 30 fencers at The Fencing
Center. We are interested in the numbers that do not use the foil
as their main weapon.
Find the probability that nine do not use the
foil as their main weapon. (Round your answer to four decimal
places.)
b) A student takes a ten-question true-false quiz, but did not
study and randomly guesses each answer. Find...

A student takes a ten-question true-false quiz, but did not
study and randomly guesses each answer. Find the probability that
the student passes the quiz with a grade of at least 40% of the
questions correct. (Round your answer to three decimal places.)

A student takes a ten-question true-false quiz, but did not
study and randomly guesses each answer. Find the probability that
the student passes the quiz with a grade of at least 50% of the
questions correct. (Round your answer to three decimal places.)

A student takes a multiple-choice test that has 40 questions.
Each question has 5 choices. The
student did not study for the test and decides to randomly guess at
each question. (Hint: The
probability of guessing correctly is 0.2.) Round the probability to
four decimal places.
a) Find the probability the student gets exactly 10 problems
correct._______________
(Show work.)
b) Calculate the mean.____________
c) Calculate the standard deviation._____________
Your flight has been delayed. At Philadelphia International
Airport, 90% of recent...

For each test, your friend studies with probability 1/2 and does
not study with probability 1/2, independently of any other test. On
any test for which she has not studied, she still has a 0.30
probability of passing, independently of whatever happens on other
test. What is the expected number of total exams taken until she
has had 2 test for which she did not study but which she still
passed?

Giving a test to a group of students, the grades and gender are
summarized below
A
B
C
Total
Male
2
3
5
10
Female
16
9
8
33
Total
18
12
13
43
If one student is chosen at random,
Find the probability that the student was female OR got an "B".
Round the solution to three decimal place
B)
A random sample of 116 statistics students were asked about
thier latest test score (pass or fail) and whether...

Java:
A teacher has five students who have taken four tests. The
teacher uses the following grading scale to assign a letter grade
to a student, based on the average of his or her four test
scores:
Test Score
Letter Grade
90–100
A
80–89
B
70–79
C
60–69
D
0–59
F
Write a class that uses a String array (or an ArrayList object)
to hold the five students’ names, an array of five characters to
hold the five students’ letter...

A student (who has not studied) is expected to get 60%
of multiple choice questions correct. Assume that he takes a test
with 10 multiple-choice questions and there are four choices per
question, and he has no idea of which of the four are correct or
incorrect. (a) What is the probability of the following
results:
(2) He gets at most three questions correct?
.216
(3) He gets at least six questions correct?

The professor of a Statistics class has stated that,
historically, the distribution of test grades in the course
resembles a Normal distribution with a mean test mark of μ=61% and
a standard deviation ofσ=9%.
(a) What is the probability that a randomly
chosen test mark in this course will be at least 73%? Answer to
four decimals.
(b) In order to pass this course, a student
must have a test mark of at least 50%. What proportion of students
will...

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