Why choose us?

We understand the dilemma that you are currently in of whether or not to place your trust on us. Allow us to show you how we can offer you the best and cheap essay writing service and essay review service.


The z-score shows the dispersion from the mean. It is computed using the following formula.
z-score =
Given x = 9, μ =10, and σ = 4. So,
z-score =
The population standard deviation of 0, 4, and 5 is calculated as follows:
s.d =
Thus, we need to obtain the mean =

S.d =

The minimum is the observation with the least value in a sample, and the maximum is the
largest number. Since the observations 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233 are
arranged in ascending order, the first observation is the minimum and the last maximum.
Minimum = 1
Maximum = 233
To obtain the first quarter (25%) we multiply the number of observations (n = 13) by 25%.
= =0.25*13 = 3.25
Thus, the 4 th observation is the first quarter.

First quarter = 3
The median is the observation at the center/middle (13/2 = 6.5 = 7 th observation)
Median = 13
Upper quartile = 0.75*13 = 9.95 = 10 th observation
Upper quartile = 89
Inter-quartile range =upper quartile – lower quartile

= 89 – 3
= 86

A standard deviation of zero deduces that the data sample are not spread, which in other
words means that they are clumped around a single value (Taylor, 2015).
It is expected that about 95% of the observations to lie between 2 standard deviations of the
It is anticipated that about 98.8% of the observations to lie between 2.5 standard deviations of
the average.
Normally distributed means that the population distribution has a bell-shaped density curve,
which can be described by its mean (average) and standard deviation . Furthermore, the

density curve is symmetrical, clustered around the mean, and the standard deviation
determines the spread of the plot.
P (x < 60000) = z () =
P (x < 60000) = 0.8413
Therefore, 84.13% of people have salaries of $60,000or less.

P (x < 40000) = z () =

= 0.1587
Therefore, 15.87% of people have salaries of $40,000or less.



Taylor, C. (2015). When Is the Standard Deviation Equal to Zero?

All Rights Reserved, scholarpapers.com
Disclaimer: You will use the product (paper) for legal purposes only and you are not authorized to plagiarize. In addition, neither our website nor any of its affiliates and/or partners shall be liable for any unethical, inappropriate, illegal, or otherwise wrongful use of the Products and/or other written material received from the Website. This includes plagiarism, lawsuits, poor grading, expulsion, academic probation, loss of scholarships / awards / grants/ prizes / titles / positions, failure, suspension, or any other disciplinary or legal actions. Purchasers of Products from the Website are solely responsible for any and all disciplinary actions arising from the improper, unethical, and/or illegal use of such Products.