Answer:
The correct solution is "3".
Step-by-step explanation:
Given that:
Mean of distribution,
[tex]x = 49[/tex]
Standard deviation,
[tex]\sigma=5[/tex]
Score,
[tex]\mu=25[/tex]
Let the score in an exam be "x".
Now,
The z-score will be:
= [tex]\frac{x-\mu}{\sigma}[/tex]
On putting the values, we get
= [tex]\frac{40-25}{5}[/tex]
= [tex]\frac{15}{5}[/tex]
= [tex]3[/tex]
