Question

I have: E=2.4/64=8/64.64=0.125

95% confidence interval ranges from 28-0.25=27.75 to 28+0.25=28.25
27.75 scores

Answer 1

What is your question?

Also, it would help if you proofread your questions before you posted them. Your first line is incorrect; these values are not equal. What does E indicate?

We cannot indicate how many scores fall within the confidence interval unless we know the total number of scores, if that is what you are indicating.