1. The problem involves interpreting a frequency distribution table for fish lengths. 2. The table shows intervals of fish lengths $l$ in centimetres and the number of fish in each interval: - $60 \leq l < 65$: 19 fish - $65 \leq l < 70$: 17 fish - $70 \leq l < 75$: 23 fish - $75 \leq l < 80$: 10 fish - $80 \leq l < 85$: 1 fish 3. The question asks about the interval $70 \leq l < 75$. 4. From the table, the number of fish in the interval $70 \leq l < 75$ is 23. 5. This means there are 23 fish whose lengths are at least 70 cm but less than 75 cm. Final answer: 23 fish are in the length interval $70 \leq l < 75$.