The outlier, 78, is removed from the data set shown.
23, 23, 25, 27, 34, 34, 35, 41, 45, 45, 78
how does this affect the range?

Well, in order o figure this out, you have to understand the definition or range.

Range is the difference between the lowest and highest values.

Since 78 use to be the highest number, the range was 55

Now when we remove the outlier, the new highest value is 45, decreasing the range to 22.

Hope this helps!