The number of hours per day a college student spends on homework has a mean of 6 hours and a standard deviation of 1.25 hours. Yesterday she spent 3 hours on homework. How many standard deviations from the mean is that? Round your answer to two decimal places. O A. 1.20 standard deviations below the mean O B. 2.40 standard deviations below the mean O c. 2.40 standard deviations above the mean O D. 1.20 standard deviations above the mean