Answer
median = $95$
Work Step by Step
Arrange the scores from least to greatest to obtain:
$30, 70, 90, 100, 100, 100$
There are six numbers.
The middle numbers are the third and the fourth scores, which are 90 and 100, respectively.
The median will be the mean of these two numbers.
Thus,
median = $\dfrac{90+100}{2} = \dfrac{190}{2} = 95$