Final answer:
To find the value one standard deviation above the mean, add the standard deviation to the mean. In this case, one standard deviation above the mean is 2.75 inches.
Step-by-step explanation:
To find the value one standard deviation above the mean, we can add the standard deviation to the mean. In this case, the mean is 2.5 inches and the standard deviation is 0.25 inches. Adding one standard deviation (0.25 inches) to the mean gives us:
2.5 inches + 0.25 inches = 2.75 inches
Therefore, one standard deviation above the mean is 2.75 inches.