Approximately what percentage of the total sample were aged 21-30 ?

For a table split into categories (rows) and sub-groups (columns), the percentage share of any one column is that column's total divided by the grand total of every entry in the table, converted to a percentage and rounded to the nearest whole percent.

1. Add every genre's entry in the Age 21–30 column: 4 + 5 + 12 + 4 + 3 + 3 + 2 = 33.

2. Add every entry in the whole table across all three age bands to get the grand total: 27 + 17 + 32 + 16 + 20 + 16 + 6 = 134.

3. Divide the column total by the grand total and convert to a percentage: 33 ÷ 134 × 100 ≈ 24.63%, which rounds to 25%.

As an independent check, add the three age-band totals instead of the seven genre-row totals: Age 15–20 = 33, Age 21–30 = 33, Age 31+ = 68; these sum to 33 + 33 + 68 = 134, matching the grand total from the rows and confirming both the sample size and the 21–30 share.

So approximately 25% of the total sample were aged 21–30.