Answer: Sally’s score was approximately 78.51.
Explanation: Sally’s score was 1.17 standard deviations above the mean. To find this, we can use the z-score formula, which is z = (x - μ) / σ, where x is the value being standardized, μ is the mean of the population, and σ is the standard deviation of the population. In this case, we know that Sally scored better than 88% of those who took the test, so her z-score is 1.17 (the z-score that corresponds to a percentile rank of 88%). Plugging this into the formula and solving for x, we get x = (z * σ) + μ = (1.17 * 3) + 75 = 78.51