The given information we have:
The average or mean:
[tex]\mu=75[/tex]The standard deviation:
[tex]\sigma=8[/tex]Since Andrew scored 1.25 standard deviations below the mean, the expression to calculate its exam score will be:
[tex]\mu-1.25\sigma[/tex]Substituting the mean and the standard deviation:
[tex]75-1.25(8)[/tex]And solving the operations:
[tex]75-10[/tex]which gives us the following result:
[tex]65[/tex]Answer: Andrew's exam score is 65
