Step 1 :1. Arrange data in ascending order: \( 12, 16, 25, 25, 29, 35, 40, 42, 45 \)
Step 2 :2. Calculate mean: \( \frac{12+16+25+25+29+35+40+42+45}{9} = \frac{269}{9} = 29.89 \)
Step 3 :3. Calculate median: Since there are 9 numbers, it is the middle value: \( 29 \)
Step 4 :4. Calculate mode: Determine the number that appears most frequently: \( 25 \)