Question

1. what does the x - axis represent?

different training rep ranges.

1. what does the y - axis represent?

percentage of muscle growth after 12 weeks of training.

1. make 3 observations about the graph.

Explanation:

1. Compare bicep growth across all rep ranges to find the highest value.
2. Compare quadriceps growth across all rep ranges to find the lowest value.
3. Compare bicep and quadriceps growth for every rep range to identify a consistent trend.

Answer:

1. The biceps show the highest percentage of muscle growth (25.0%) in the 8-15 reps (80% of 1RM) range.
2. The quadriceps show the lowest percentage of muscle growth (8.9%) in the 50-80 reps (20% of 1RM) range.
3. For every tested rep range, the biceps have a higher percentage of muscle growth than the quadriceps.