Question

the amount of money that students spend on their cell phones per week in normally distributed with a mean of 52.00 and standard deviation of 6.00. 1.2.1 What is the probability that a student studies for more that 60.00 per week? 1.2.2 find the probability that the mean amount of money on cell phones for three randomly selected students is less than 60.66 per week.

Answer #1

Suppose the amount spent on cell phone service for students per
month is normally distributed and has a mean of $54 and a standard
deviation of $9.
Binomial or Normal?
What is the probability that the monthly cell phone bill for a
randomly selected Wake Tech student is more than $60?
What is the probability that the monthly cell phone bill for a
randomly selected Wake Tech student is less than $50?
Most student’s bill will be in the middle...

Suppose that the amount of time INTI International University
students spend in the library
per week is normally distributed. A sample of 6 students is
selected at random, and the
sample mean computed as 13.83 hours with the standard deviation of
2.86 hour. Test at 1%
significance level whether the mean number of hours spend in the
library per week is less
than 15 hours.

The times per week a student uses a lab computer are normally
distributed, with a mean of 6.2 hours and a standard deviation of
1.3 hours. A student is randomly selected. Find the following
probabilities.
(a) Find the probability that the student uses a lab computer
less than 4 hours per week.
(b) Find the probability that the student uses a lab computer
between 6 and 8 hours per week.
(c) Find the probability that the student uses a lab...

The times per week a student uses a lab computer are normally
distributed, with a mean of 6.3 hours and a standard deviation of
1.2 hours. A student is randomly selected. Find the following
probabilities.
(a) Find the probability that the student uses a lab computer
less than 5 hours per week.
(b) Find the probability that the student uses a lab computer
between 6 and 8 hours per week.
(c) Find the probability that the student uses a lab...

The times per week a student uses a lab computer are normally
distributed, with a mean of 6.1 hours and a standard deviation of
1.3 hours. A student is randomly selected. Find the following
probabilities.
(a) Find the probability that the student uses a lab computer
less than 4 hours per week.
(b) Find the probability that the student uses a lab computer
between 7 and 8 hours per week.
(c) Find the probability that the student uses a lab...

4. The amount of time in hours that college students spend on
facebook per week is normally distributed with a mean of 40. You
decide to conduct your own test. In a random sample of 60 college
students you find that the mean time per week spent on facebook is
37.8 hrs and the standard deviation is 12.2. Does this mean differ
significantly from the national average? Test your hypothesis at
the .05 significance level and state your conclusion.

Suppose that the amount of money spent per week on groceries is
normally distributed with an unknown mean and standard deviation. A
random sample of 20 grocery bills is taken and gives a sample mean
of $79 and a sample standard deviation of $13.
Use a calculator to find a 95% confidence interval estimate for
the population mean using the Student's t-distribution.
Round your answer to two decimal places

5)
A study found that consumers spend an average of $24 per week
in cash without being aware of where it goes.
Assume that the amount of cash spent without being aware of
where it goes is normally distributed and that the standard
deviation is $6.
What is the probability that a randomly selected person will
spend more than $28?

#5 A study of adult cell phone owners found that their annual
income was normally distributed with a mean of $41,200 and a
standard deviation of $18500. If sellers of cell phones wish to
target the adult owners of cell phones whose incomes are in the top
83%. What is the minimum income level for the top 83% of the
group?
#4 The heights of high-school students are normally distributed
with a mean of μ = 62.5 inches and standard...

It has been determined that the mean amount of time that
computer science majors spend on homework each week is
approximately normally distributed with a mean of 15.2 hours and
standard deviation 3.1 hours. What is the probability that a
randomly selected computer science major will spend more than 14.5
hours on homework in a given week?

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