Set correct answer for question 2

The underscores were missing around the correct answer for question DataScienceSpecialization#2

Author: RobinSmithCA

06_StatisticalInference/homework/hw1.Rmd

@@ -64,7 +64,7 @@ A random variable, $X$, is uniform, a box from $0$ to $1$ of height $1$. (So tha
 
 1. 1.00
 2. 0.75
-3. 0.50
+3. _0.50_
 4. 0.25
 
 *** .hint