Solve the Problem $\mathrm { Q } _ { 3 }$

Multiple Choice

Solve the problem.
-Scores on a test have a mean of 67 and $\mathrm { Q } _ { 3 }$ is 83. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth.

A) 21.3
B) 12
C) 10.7
D) 23.9