Question 1195530
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Assume that x has a normal distribution with the specified mean and standard deviation. 
Find the indicated probability. (Enter a number. Round your answer to four decimal places.)
𝜇 = 20; 𝜎 = 3.8
P(x ≥ 30) =
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The normal distribution curve is a bell shaped curve.


The question is to determine the area under the GIVEN normal distribution curve to the right of 30 units.



Go to website 


https://onlinestatbook.com/2/calculators/normal_dist.html


and use free of charge online calculator specially intended for this purpose.



Input  20  in the port window  " Mean ";


input &nbsp;3.8 &nbsp;in the port window &nbsp;&nbsp;&nbsp;&nbsp;" SD ";    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;( <<<---===  SD means "standard deviation" )


input number &nbsp;30 &nbsp;in the port windows &nbsp;" ABOVE ".


Then click the button &nbsp;" Recalculate ".



You will get the &nbsp;{{{highlight(highlight(ANSWER))}}} &nbsp;0.0042 &nbsp;in the window &nbsp;" Area &nbsp;(probability) ".



The shaded area in the plot shows you the area of the interest.



Every time as you get similar problem, &nbsp;you can solve it this way.



This way is the easiest and shortest way to learn the subject.



When you learn the subject enough, &nbsp;you will be ready and may start learning other ways.