Customers arrive at a grocery store at an average of 2.2 per
minute. Assume that the number of arrivals in a minute follows the
Poisson distribution. Provide answers to the following to 3 decimal
places.
Part a)
What is the probability that exactly two customers arrive in a
minute?
Part b)
Find the probability that more than three customers arrive in a
two-minute period.
Part c)
What is the probability that at least seven customers arrive in
three minutes, given...
Mrs. Smith's reading class can read an average of 175 words per
minute with a standard deviation of 20 words per minute. The bottom
6% of the class is to receive a special training session. What is
the minimum number of words per minutes a student would need to
read in order to get training?
The average amount of money spent for lunch per person in the
college cafeteria is $5.67 and the standard deviation is $2.76.
Suppose that 45 randomly selected lunch patrons are observed.
Assume the distribution of money spent is normal, and round all
answers to 4 decimal placeswhere possible. What is the distribution
of X ? X ~ N( , ) What is the distribution of ¯ x ? ¯ x ~ N( , )
For a single randomly selected lunch...
The average amount of money spent for lunch per person in the
college cafeteria is $7.14 and the standard deviation is $2.14.
Suppose that 18 randomly selected lunch patrons are observed.
Assume the distribution of money spent is normal, and round all
answers to 4 decimal placeswhere possible.
What is the distribution of XX? XX ~ N(,)
What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
For a single randomly selected lunch patron, find the
probability that this patron's lunch...
The average amount of money spent for lunch per person in the
college cafeteria is $6.63 and the standard deviation is $2.54.
Suppose that 18 randomly selected lunch patrons are observed.
Assume the distribution of money spent is normal, and round all
answers to 4 decimal places where possible.
What is the distribution of XX? XX ~ N(,)
What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
For a single randomly selected lunch patron, find the
probability that this patron's...
You have a dataset of the average number of chirps per minute
for a sample of 30 crickets. You find that the mean number of
chirps per minute is 40 and that the number of chirps per minute
has a standard deviation of 5 chirps. You want to test that the
mean number of chirps per minute for a cricket is greater than 38
using a significance level of .05. What is the value of your test
statistic? Round your...
Customers arrive at a grocery store at an average of 2.1 per
minute. Assume that the number of arrivals in a minute follows the
Poisson distribution. Provide answers to the following to 3 decimal
places.
Part a)
What is the probability that exactly two customers arrive in a
minute?
Part b)
Find the probability that more than three customers arrive in a
two-minute period.
Part c)
What is the probability that at least seven customers arrive in
three minutes, given...
You want to understand sampling distribution. The average
number of children per woman is 2.2 with a standard deviation is
.1. If you took a sample of 16 women, what is the probability that:
The average of this group is less that 2.3?
The average for this group is greater than 2.45?
The average for this group lies between 2.15 and
2.4.
(10)
You are not sure if the mean value is correct but you believe
that the standard deviation...
The average number of customers at a window of a certain bank
per minute during banking hours is four. Find the probability that
during a given minute. i. No customers appear ii. Three or fewer
customers