Need the correct answer as i am practicing with the reference book and the answers are not available i have done the solution but need to confirmed the answers.

If normal random variable from a normally distributed population with mean 40 and standard deviation 5, is 49. The value of standard normal random variable will be ____________

1. 1.8
2. 0.4
3. -0.4
4. -1.4

If normal random variable from a normally distributed population with mean 55 and standard deviation 5, is 48. The value of standard normal random variable will be ____________

1. 1.4
2. 0-1.4
3. 0.4
4. -0.4

Standard error is _____________ non- negative.

1. mostly
2. never
3. some time
4. always