An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an estimate at the 85% level of confidence. For a sample of 1230 third graders, the mean words per minute read was 29.5. Assume a population standard deviation of 6.3 Construct the confidence interval for the mean number of words a third grader can read per minute. Round your answers to one decimal place.

Lower endpoint ______ Upper End Point ______ My issues is with the Z value, at first I used the standard (x-u)/strd for another problem and ended up getting it completley wrong. I then went to look at similar problems, and compared their z score to mine (me caluclating it) and it was still off. I then used the percentage, to find the z value in an online calculator. The values it was putting out and the ones the people on here were getting were still different. So I am really just hung up on the z value portion.