Answer:
-0.44
Step-by-step explanation:
Given a mean of 43.8 and a standard deviation of 8.7
[tex]z-score =\frac{x-mean}{standard deviation}[/tex]
mean = 43.8
standard deviation = 8.7
now plug in the values of mean and standard deviation
x= 40
[tex]z-score =\frac{40-43.8}{8.7}[/tex]
[tex]z-score =\frac{-3.8}{8.7}[/tex]
z-score = -0.44
