How do you find mode in a data set when no 2 numbers are the same?

The two-way frequency table below shows data on playing a sport and playing a musical instrument for students in a class.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4