Question

1. (a) The time needed to complete a final examination in a particular college course is normally distribution with a mean of 80 minutes and a standard deviation of 10 minutes. What is the probability that a student will complete the exam between 60 and 100 minutes?

1 (b) The mean preparation fee H&R Block charged retail customers last year was $183. Use this price as the population mean and assume the population standard deviation of preparation fees is $50. What is the probability that the mean price for a sample of 50 H&R Block retail customers is within $8 of the population mean?

Answer #1

1.

a)

*μ*=80,
*σ*=10

We need
to compute Pr(60≤*X*≤100).

The corresponding z-values =

Therefore, we get:

b)

*μ*=183,
*σ*=50, *n*=50

We need to compute prob of probability that the mean price for a sample of 50 H&R Block retail customers is within $8 of the population mean which means between183 - 8 and 183 + 8 .ie.175 and 191.

Pr(175≤*X*ˉ≤191).
The corresponding z-values needed to be computed are:

Therefore, the following is obtained:

please like )

11) The time needed to complete a final examination in a
particular college course is normally distributed with a mean of 90
minutes and a standard deviation of 15 minutes. Answer the
following questions. a. What is the probability of completing the
exam in one hour or less? b. What is the probability that a student
will complete the exam in more than 60 minutes but less than 105
minutes? c. Assume that the class has 60 students and that...

The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 77 minutes
and a standard deviation of 12 minutes. Answer the following
questions.
a. what is the probability of completing the exam in one hour or
less (to 4 decimals)
b. what is the probability that a student will complete the exam
in more than 60 minutes but less than 75 minutes (to 4
decimals)
c. assume that the class...

The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 80 minutes
and a standard deviation of 10 minutes. If students have only 100
minutes to complete the exam, what percentage of the class will not
finish the exam in time?

The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 80 minutes
and a standard deviation of 10 minutes. Answer the following
questions.
(a)
What is the probability of completing the exam in one hour or
less? (Round your answer to four decimal places.)
(b)
What is the probability that a student will complete the exam in
more than 60 minutes but less than 75 minutes? (Round your answer
to...

he time needed to complete a final examination in a particular
college course is normally distributed with a mean of 80 minutes
and a standard deviation of 10 minutes. Answer the following
questions. (a) What is the probability of completing the exam in
one hour or less? (Round your answer to four decimal places.) (b)
What is the probability that a student will complete the exam in
more than 60 minutes but less than 65 minutes? (Round your answer
to...

(4pt) The time needed to complete a final examination in
college in the United States is normally distributed with a mean of
90 minutes and standard deviation of 10 minutes.
(2pt) What is the probability of completing a final exam in
more than 100 minutes?
Answer:
(2pt) What is the probability of finishing a final examination
between 60 to 120 minutes?
Answer:

The time needed to complete a final quiz in a particular college
course is normally distributed with a mean of 77 minutes and a
standard deviation of 12 minutes. Answer the following
questions.
a. What is the probability of completing the
quiz in one hour or less (to 4 decimals)?
b. What is the probability that a student will
complete the quiz in more than 60 minutes but less than 75 minutes
(to 4 decimals)?
c. Assume that the class...

a set of final examination grades in an introductory
statistics course is normally distributed with a mean of 77 and a
standard deviation of 7 complete parts a through d.
a. what is the probability that a student scored below 89 on this
exam
b. what is the probability that a student scored between 70 and
93
c. the probability is 15% that a student taking the test scores
higher than what grade
d. if the professor grades on a...

The mean preparation fee H&R Block charged for taxes in 2012
was $183. Use this price as a population mean and assume the SD of
the population is $50.
a) What is the probability that the mean price for a sample of
30 H&R Block customer is within $8 of the population mean?
b) What is the probability that the mean price for a sample of
50 H&R Block customer is within $8 of the population mean?
c). What is...

You may need to use the appropriate appendix table to answer
this question.
The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 80 minutes
and a standard deviation of 10 minutes. Answer the following
questions.
(a)What is the probability of completing the exam in one hour or
less? (Round your answer to four decimal places.)
(b)What is the probability that a student will complete the exam
in more than...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 20 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago