1. ## Sample size

The monthly starting salaries of students who receive engineering degrees have a standard deviation of $600. What sample size should be selected so that there is 0.95 probability of estimating the mean monthly income within$150 or less

2. solve for n in the equation

$z_{\alpha/2}\sigma/\sqrt{n}\le B$

with $z_{\alpha/2}=1.96$
B=150
and $\sigma =600$

3. with
B=150
and

N = 225

Please let me know if this is correct

4. the answer is 61. i jsut worked on the formula again