Question 1199363
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This problem is on Binomial distribution.


If you don't know how to approach this problem with its several questions, it means that
you are unfamiliar with Binomial distribution.


At this site,  there are several lessons where many similar problems were solved and presented in all details


&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Probability-and-statistics/Solving-problems-on-Binomial-distribution-manually.lesson>Simple and simplest probability problems on Binomial distribution</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Probability-and-statistics/Typical-binomial-distribution-probability-problems.lesson>Typical binomial distribution probability problems</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Probability-and-statistics/Solving-problems-on-Binom-distr-with-Technology-%28using-online-solver%29.lesson>Solving problems on Binomial distribution with Technology (using online solver)</A> 


Look into these lessons.


After reading/learning from these lessons, &nbsp;you will be able to solve such problems on your own, which is your 

PRIMARY &nbsp;MAJOR &nbsp;GOAL &nbsp;visiting this forum &nbsp;(I believe).


If you will have questions after reading these lessons, do not hesitate to post your questions to the forum.



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<pre>
Regarding μX, use the formula  μX = n*p,   


    where n is the number of trials  (45 in your problem), 
    and p is "the probability of individual success at each single trial",
    p = 0.399 in your problem.



Regarding  σX,  use the formula  σX = {{{sqrt(n*p*(1-p))}}}.
</pre>


See the links


https://stats.libretexts.org/Bookshelves/Introductory_Statistics/Book%3A_Statistics_Using_Technology_(Kozak)/05%3A_Discrete_Probability_Distributions/5.03%3A_Mean_and_Standard_Deviation_of_Binomial_Distribution


https://study.com/skill/learn/how-to-calculate-the-standard-deviation-of-a-binomial-distribution-explanation.html


https://study.com/skill/learn/how-to-calculate-the-standard-deviation-of-a-binomial-distribution-explanation.html



It is written in each and every textbook on Statistics and in thousands Internet web-sites.