Question

6) The average for the statistics exam was 75 and the standard deviation was 8. Andrew was told by the instructor that he scored 1.25 standard deviations below the mean. What was Andrew's exam score?

Answer 1

The given information we have:

The average or mean:

`\mu=75`

The standard deviation:

`\sigma=8`

Since Andrew scored 1.25 standard deviations below the mean, the expression to calculate its exam score will be:

`\mu-1.25\sigma`

Substituting the mean and the standard deviation:

`75-1.25(8)`

And solving the operations:

`75-10`

which gives us the following result:

`65`

Answer: Andrew's exam score is 65