And if you shift a random variable, the corresponding mean is going to be shifted by the same amount. So the mean of N is going to be 10 times the mean of X, minus 15, which is equal to 10 times 1.2 minus 15. This is 1.2. So it is 12 minus 15, which is equal to negative three. Now the standard deviation of N is going to be slightly different. For the standard deviation, scaling matters. If you scale a random variable by a certain value, you would also scale the standard deviation by the same value.