Answer:
45 is 2 standard deviations below the mean (60).
Step-by-step explanation:
2 standard deviations below the mean is equivalent to what you have written here.
To answer this, start with the mean (60) and subtract 2 standard deviations (2 times 7.5). Subtract, as indicated:
60 - 2(7.5) = 60 - 15 = 45
