Blake E. answered • 10/08/20

Licensed Occupational Therapist For Science and Writing

This seems like a simple Z score problem. I would calculate the Z score then find the __complementary mean related to that score__ which should be tabulated in your stats book.

The formula for calculating Z score=x–µ/σ

So in this case Z=400-250/80=1.875

Like any good OT using backward chaining to teach a concept, I will leave the final step up to you.