Post a New Question


posted by on .

1. A test has a mean of 50, standard deviation of 10.
A. What scores separate the middle 25% from the rest
b. What proportion would be expected to score between 45 and 55
c. What proportion would be expected to score 68 and above

  • statistics - ,

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions and their related Z scores.

    A. Find the Z score with .125 between score and mean. Insert ±Z value in the above equation and solve for the scores.

    B and C. Solve for Z scores and use the table.

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions

Post a New Question