Mean and Standard deviation of a sum

[dvani]

A die is rolled 50 times.
What is the expected value of sum of 50 rolls and and standard deviation of the sum of 50 rolls?

 

[Mohit Gulati]

if you roll a die once so expected value comes to to be 3.5 if you roll 50 times to expected value comes to be
50*3.5 = 175

if you roll a die once so variance comes to be 2.916667 if you roll 50 times to
variance comes to be 50*2.916667 and stdev will be sqrt(50*2.916667)