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Given independent random​ variables, X and​ Y, with means and standard deviations as​ shown, find the...

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Statistics

Given independent random​ variables, X and​ Y, with means andstandard deviations as​ shown, find the mean and standard deviationof each of the variables in parts a to d.

​a) X−11
​b)0.7Y
​c)X+Y
​d)X−Y
  

Mean

SD

X

90

13

Y

20

5

​a) Find the mean and standard deviation for the random variableX-11.

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