what is the proportion of students with a raw score less than 10? if information was collected from fellow students the rating on a 5 point scale on 5 different questions. given a normally distributed population with a mean of 13, a standard deviation of 3, and 50 as the number of cases. what is the percentage of students with a raw score less than 20?

Question

what is the proportion of students with a raw score less than 10? if information was collected from fellow students the rating on a 5 point scale on 5 different questions. given a normally distributed population with a mean of 13, a standard deviation of 3, and 50 as the number of cases. what is the percentage of students with a raw score less than 20?
what is the number of students with raw scores between 10 and 20?

PsyDAG · Answer

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores. For percentage, multiply by 100. For n, multiply by 50.

Cathy · Answer

Given a normally distributed population with a mean (μ) of 7, a standard deviation (σ) of 3, and 50 as the
number of cases (N), answer the following questions:
4.1 What is the proportion of cases with a raw score greater than 5?
4.2 What is the percentage of cases with a raw score greater than 15?
4.3 What is the number of cases with raw scores between 5 and 15?