Answer:
-2.333
Step-by-step explanation:
In a certain normal distribution of scores, the mean is 30 and the standard deviation is 3. Find the z-score corresponding to a score of 23.
The z-score corresponding to an observed value in a normal distribution is calculated as;
z-score = (observed value - mean)/(standard deviation)
Our observed score is 23, the mean is 30, and the standard deviation is 3. The z-score will thus be;
z-score = ( 23 - 30)/( 3)
z-score = -2.333
Answer:
- 2.333
Step-by-step explanation:
The formulae to apply here is;
z= (x-μ) / δ------------where x is the score, μ is the mean and δ is the standard deviation
Given x=23, μ=30 and δ= 3
z= (23-30) / 3 z= - 7/3 z= -2.333
