IfX= 0.85,n= 100, andσ2 = 25, find thep–value for the test of the hypothesis

H0 :μ= 0 vs.H1 :μ (not=)0.

I understand how to perform the test, just not how to calculate the p value. I know the theory, just need a practical example. If anyone could do this question that would be great. Thanks