4.34, 4.35: Variance of Random Variables | Exercise Solution of Probability & Statistics by Walpole

This is the exercise problems solution of the 9th edition of"Probability and Statistics for Engineers and Scientists by Walpole". In this video, I solve exercise problems 4.34 and 4.35 to find the variance and standard deviation by using the joint probability function.
4.34: Let X be a random variable with the following
probability distribution:
x −23 5
f(x) 0.3 0.2 0.5
Find the standard deviation of X.
4.35: The random variable X, representing the number of errors per 100 lines of software code, has the following probability distribution:
x 2 3 45 6
f(x) 0.01 0.25 0.4 0.3 0.04
Using Theorem 4.2 on page 121, find the variance of X.
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Happy Learning :-)

[@octal3459]

love the work keep it up

[@EngineeringTutorOfficial]

Thank you so much

[@ghostpotat2882]

octal didnt know how to solve this. thanks for the solution helped a lot

[@octal3459]

yo?

[@ghostpotat2882]

@@octal3459 😉

[@EngineeringTutorOfficial]

Thank you