Question
In: Statistics and Probability
Problem 7-28 A student selects his answers on a true/false examination by tossing a coin (so...
Problem 7-28 A student selects his answers on a true/false examination by tossing a coin (so that any particular answer has a .50 probability of being correct). He must answer at least 70% correctly in order to pass. Find his probability of passing when the number of questions is
(a) 10 Pr=
(b) 20 Pr=
(c) 50 Pr=
(d) 100 Pr=
Solutions
orchestra answered 1 year agoRelated Solutions
A true/false test has ? = 20 questions. If a student is simply guessing the answers...
A true/false test has ? = 20 questions. If a student is simply
guessing the answers
(so there is a 50% chance of getting correct for each
question),
a) what is the mean and standard deviation of the number of
questions the student would get
correct?
Mean = ______, Standard deviation = ______
b) what is the approximate probability (approximated by a
normal distribution) that this student would get at least 15
questions correct?
P (at least 15 questions correct)...
#21 A true/false quiz consists of 28 questions. If all answers are random guesses, estimate the...
#21
A true/false quiz consists of 28 questions. If all answers are
random guesses, estimate the probability of getting at most 18
correct by using the normal distribution as an approximation to the
binomial distribution. Enter your answer rounded to four decimal
places.
2) True or False (If statement is false, correct it so that it is true) a)...
2) True or False (If statement is false, correct it so that it
is true) a) Polymers make up an exciting class of biomaterials.
Polyethylene is a wonderful example of a simple ceramic that can be
used in multiple applications by modifying its chemical structure.
It tends to be bioactive when used by itself as an implant, but it
becomes even more bioactive when 10 vol% Calcium Carbonate is added
to it. Teflon can be used as a vascular graft...
Check 1 ptRetries 1 A fair coin is tossed 7 times. Compute the probability of tossing...
Check 1 ptRetries 1
A fair coin is tossed 7 times. Compute the probability of
tossing 7 tails in a row.
1128
Enter your response as a reduced fraction.
Question Help:
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Unattempted Question 2
Check 1 ptRetries 1
A CEO of Awesome Coolers owns 4 pairs of pants, 13
shirts, 8 ties and 3 jackets. How many different outfits can he
wear to the office if he must wear one of each item?
The CEO has different outfits....
A student takes an exam containing 13 true or false questions. At least 9 correct answers...
A student takes an exam containing 13 true or false questions.
At least 9 correct answers are required to pass. If the student
guesses, what is the probability that he will pass? Round your
answer to four decimal places.
Problem 1 [20 pts]: An experiment consists of tossing a coin 6 times. Let X be...
Problem 1 [20 pts]: An experiment consists of tossing a
coin 6 times. Let X be the random variable that is the number of
heads in the outcome. Find the mean and variance of X.
Thank You
A student answers a multiple choice examination with two questions that have four possible answers each....
A student answers a multiple choice examination with two
questions that have four possible answers each. Suppose that the
probability that the student knows the answer to a question is 0.80
and the probability that the student guesses is 0.20. If the
student guesses, the probability of guessing the correct answer is
0.25. The questions are independent, that is, knowing the answer on
one question is not influenced by the other question.
(a) What is the probability that the both...
A student is fed up with doing his PHYS400 problem set, so he throws his pen...
A student is fed up with doing his PHYS400 problem set, so he
throws his pen up vertically at 10.64 m/s. How long does it take
for the pen to reach its maximum height? Given that g=-9.8m/s^2 .
Give your answer to 3 significant figures without units.
3.2 Our overworked student trudges to his 3rd exam of the day, a true/false exam with...
3.2 Our overworked student trudges to his 3rd exam of the day, a
true/false exam with 100 questions. Again,he just guesses the
answers. Notice that this time he has a 50% chance of getting each
particular question correct.
a. What is the probability that the student gets at least one
question correct?
b. What is the probability that the student gets between 15 and
35 questions (inclusive) correct?
c. What is the probability that the student gets between 40 and...
3.2 Our overworked student trudges to his 3rd exam of the day, a true/false exam with...
3.2 Our overworked student trudges to his 3rd exam of the day, a
true/false exam with 100 questions. Again,he just guesses the
answers. Notice that this time he has a 50% chance of getting each
particular question correct. (10 Marks: 2 Marks for each of parts
a), b), c), d) and e).
a. What is the probability that the student gets at least one
question correct?
b. What is the probability that the student gets between 15 and
35 questions...
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