Calculating the mean pulse rate after running Steps:

• Add the three pulse rates after running: 152 + 157 + 155 = 464 bpm.
• Divide the total by the number of measurements: 464 ÷ 3 ≈ 154.67 bpm.
• Round to the nearest whole number: 154.67 rounds to 155 bpm.

Why C is correct:

• The mean is the sum of values divided by the count (arithmetic mean formula), and 154.67 rounds to 155 per standard rounding rules.

Why the others are wrong:

• A: Matches the approximate mean at rest (62–63 bpm), not after running.
• B: Equals the unrounded mean (154.67 bpm) without nearest-integer rounding.
• D: Equals one individual measurement (157 bpm), not the average.

Final answer: C