Question

Scores on a math midterm are distrubted under a standard normal curve. A randomly selected student had a score of 55, which represented a z score of -2.35. If the mean for the exam was 76, determine the standard deviation for the exam.

Answer 1

\[z=\frac{X-\mu}{\sigma}\]
\[-2.35=\frac{55-76}{\sigma}\]
\[\sigma=\frac{55-76}{-2.35}\]
Can you calculate sigma (the standard deviation) now?

Answer 2

how do i do that?