Question

Let's say that the length of time that it takes to fill a
prescription at CVS can be shown with a uniform distribution of the
intervals from 5 to 25 minutes. What is the probability that it
takes between 15 and 20 minutes to fill the next
prescription?

Answer #1

The length of time it takes to fill an order at the canteen at
Westminster Business School is normally distributed with a mean of
4.1 minutes and standard deviation of 1.3 minutes.
ii) What is the probability that the average waiting time for a
random sample of ten customers is between 4.0 and 4.2 minutes?
iii) If the probability that the waiting time for a random
sample of ten customers is greater than ɑ minutes is equal to 95%,
what...

Part 1: The length of time it takes to find a parking space at 9
A.M. follows a normal distribution with a mean of 6 minutes and a
standard deviation of 3 minutes.
Find the probability that it takes at least 9 minutes to find a
parking space. (Round your answer to four decimal
places.)
Part 2: The length of time it takes to find a parking space at 9
A.M. follows a normal distribution with a mean of 5...

The time that it takes for the next train to comes follows a
Uniform Distribution with f(x) = 1/10 where x goes between 6 and 16
minutes. Round answers to 4 decimals when possible.
1. Find the probability that the time will be at most 7
minutes.
2. Find the 10th percentile.

1)
Let's say that we use 16 mice in a study that seeks a
relationship between the concentration (x) of a toxic substance and
the mortality time of mice (y), and the findings given in the table
below are obtained. Is there a relationship between concentration
and death time? What is the direction and strength of the
relationship? Find it with correlation
analysis.
Concentration (microgram)
Death time (minutes)
20
20
25
18
30
18
35
16
40
17
45
16...

6. The length of time it takes a shopper to
find a parking spot in the Costco parking lot follows a normal
distribution with a mean of 4.5 minutes and a standard deviation of
1.2 minutes.
What is the probability that a randomly selected shopper will
take between 3 and 5 minutes to find a parking spot? Include 4
decimal places in your answer.
7. The amount of gold found by miners in Alaska
per 1,000 tons of dirt follows...

The
time it takes a car to get from City A to city B is normally
distributed with a mean of 30 minutes and a standard deviation of 5
minutes. So let's say that 40% of the cars take less than x minutes
to get from A to B.

Let x be a random variable that represents the length of time it
takes a student to write a term paper for Dr. Adam’s Sociology
class. After interviewing many student, it was found that x has an
approximately normal distribution with mean u=6.8 hours and
standard deviation =2.1 hours.
Convert each of the following x intervals to standardized z
intervals
x < 7.5
5 < x < 8
Using the above information, convert each of the following z
intervals to...

The length of time it takes to find a parking space at 9 A.M.
follows a normal distribution with a mean of 5 minutes and a
standard deviation of 3 minutes. Sixty percent of the time, it
takes more than how many minutes to find a parking space? (Round
your answer to two decimal places.)

Bus travel. The length of time a bus takes to travel from two
locations in a big city is normally distributed. A random sample of
6 trips took 23, 19, 25, 34, 24, and 28 minutes, respectively.
Assume that the sample standard deviation is 5.09. a) Determine the
margin of error (i.e. error of the estimate) at 90% confidence. b)
Determine and interpret the 90% confidence interval for the true
mean travel time. c) Suppose that the bus company claims...

Assume we are interested in the time it takes to complete a
memory task for a dementia screening test. This distribution of
this timing follows a normal distribution with a mean of 15 minutes
and variance of 4 minutes.
What is the probability that a randomly selected participant’s
time is longer than 7 minutes?
1-p<7
7-15/2 = 1-0.5 = 0.5
What is the probability that that same
participant’s time is between 16 and 17 minutes?
What is the probability of...

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