Z score problem stat 101

#1
Trying to solve a problem for z score distribution using these z score tables: http://z-scoretable.com/. Can you please also include a how you get to the solution. Thanks!

The standard normal distribution is a probability distribution with a mean of 0 and a
standard deviation of 1. Compare raw scores from different scales by converting them to Z
scores (same as standardizing values). Recall that z = (X-M)/s (where X = the score, M is the mean of
the sample, and s is the standard deviation.

a. A population was normally distributed with a mean of 8 and SD of 3.
What proportion of the scores are below 10?
 

staassis

Active Member
#2
Convert to the Z-score and then use the probability table for standard normal distribution. Such a table is surely at the back of your Statistics 101 textbook.