If you multiply each entry of a set by 3 and added 1, how would the mean and standard deviation change? Statistics Random Variables Addition Rules for Variances 1 Answer Chandra S. Nov 2, 2015 Let Y = 3X + 1, then if #barx# and #sigma# are the mean and S.D. of X, then those of y are respectively #bar y# = 3#barx# + 1 and #sigma_y# = 3 #sigma_x# Answer link Related questions If you add two independent random variables, what is the standard deviation of the combined... What is the procedure for calculating the new standard deviation for two combined random... If I know the mean, standard deviation, and size of sample A and sample B, how do I compute the... Can you find the standard deviation of negative numbers? What is the difference between the standard deviation and margin of error? Can a sample have a standard deviation of zero? If you are calculating the standard deviation of measurements, how do you determine how many... Question #d281c A data set has a variance of 0.16. What is the standard deviation of the data set? How do I calculate the variance and standard deviation of 102, 104, 106, 108, 110? See all questions in Addition Rules for Variances Impact of this question 3332 views around the world You can reuse this answer Creative Commons License