Answer to Question #265440 in Statistics and Probability for dyeeessss

Question

the mean grade in physics examination was 75 and the standard deviation was 5. Determine the grade of the student whose standard is -0.5

Answer 1

$\mu=75 \\ \sigma=5$

Standard score z = -0.5

$z = \frac{x- \mu}{\sigma} \\ -0.5 = \frac{x -75}{5} \\ -2.5 = x -75 \\ x = 75-25 = 50$

Answer: 50