A Stat question need to be solved, hope can get the right answer. Explanations are not necessary. just want to make sure my own answer is right.

Question 6 In a planned study, there is a known population with a normal distribution, u = 50, and o = 5. What is the predicted effect size d if the researchers predict that those given an experimental treatment have a mean of: 4points Number Help a' 52 Number ' b. 54 Number ' c. 56 Number ' d. 47