Question

The average score on a stats midterm was 73 points with a standard deviation of 7 points. Gregory s-score was -2. How many points did he score?

Answer 1

scoressolution

average = 73

SD = 7

then

$-2=\frac{n-73}{7}$

where n = number of points, so:

$\begin{gathered} -2\cdot7=\frac{n-73}{7}\cdot7 \\ -14=n-73 \\ -14+73=n-73+73 \\ n=59 \end{gathered}$

answer: 59 points he scores