A basketball player made five at a six free throws. What percent of free throws did he miss?

To find the percentage of free throws the basketball player missed, we need to calculate the ratio of missed free throws to the total number of free throws attempted and multiply it by 100.

The basketball player made 5 out of 6 free throws, meaning he missed 6 - 5 = <<6-5=1>>1 free throw.
Therefore, 1 free throw was missed out of 6 attempts.

To find the percentage, we divide the number of missed free throws by the total number of free throws attempted and multiply by 100: (1 / 6) × 100 = 16.67%

So, the basketball player missed 16.67% of the free throws.