Question 1192102
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I'll do problem 1 to get you started.


Draw a bell curve as shown below. At the very center, where the hill is at its peak, we have the mean = 30.


The gap between adjacent tickmarks is a gap of 1 standard deviation, which in this case is 5 units. 
In other words, the gap between any adjacent tickmarks is 5 units.


If we started at the center (mean = 30) and moved 1 tickmark or standard deviation to the right, then we arrive at 30+5 = 35.
Another tickmark over and we arrive at 30+2*5 = 40
and so on


The same idea applies in reverse when going to the left.
Start at mean = 30 and move 1 tickmark to the left to get to 30-5 = 25
Then another tick over and we get to 30-2*5 = 20
and so on.


Standard convention is to do 3 standard deviations away from the mean (which accounts for roughly 99.7% of the normally distributed population; according to the Empirical Rule)
This accounts for the following tickmarks on the x axis:
15, 20, 25, 30, 35, 40, 45


This is what the final sketch should look like
<img width="50%" src = "https://i.imgur.com/ihSBc8x.png">
I used GeoGebra to make the figure, which is free software. I encourage this route as well, or any free online software that offers similar capabilities. 
Though if your teacher wants you to sketch by hand, then be sure to follow those instructions of course.


If you wanted, you can add in the labels shown in blue
<img width="50%" src = "https://i.imgur.com/p9is99V.png">
to get a better sense of what each location is.
Something like {{{mu+2*sigma}}} means we're 2 standard deviations above the mean
While another example like {{{mu - 3*sigma}}} indicates we're now 3 standard deviations below the mean. 
{{{mu}}} = greek letter mu = mean
{{{sigma}}} = greek letter sigma = standard deviation


Optionally you can add in vertical lines to help better separate the various pieces or sections.
<img width="50%" src = "https://i.imgur.com/b2bhsR7.png">
The vertical lines also help show the markers of each standard deviation distance from the center mean.


Side note: the vertical lines at 15 and 45 are barely noticeable. These locations are 3 standard deviations away from the mean.
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