Approximate 49.995 to 4 significant figures

To approximate 49.995 to 4 significant figures, we look at the fifth digit. The first four significant figures are 4, 9, 9, 9. The fifth digit is 5, which means we round up the fourth significant figure.
Rounding 49.99 up by 0.01 gives 50.00.

The approximation is $\boxed{\text{50.00}}$.

blue, red, white, blue, white.
The mode is the value that appears most frequently in a data set.
Let's count the occurrences of each colour