ogy Exalli were normally distributed with a me tandard deviation of 8. About what percentage of scores were less than 59? . A failing grade on the exam was anything 2 or more standard deviations below the mean. W the cutoff for a failing score? Approximately what percentage of the students failed? c. What is the standard score for an exam score of 67? d. What is the standard score for an exam score of 79? 4. Percentiles. Use table below to find the approximate standard score of the following data values a. A data value 1 standard deviation below the mean b. A data value 0.5 standard deviation below the mean C. A data value 1.5 standard deviations above the mean 5, Percentiles, Use table below to find the approximate standard score of the following data values. Then state the approximate number of standard deviations that the value lies above or below the mean. a, A data value in the 30th percentile b, A data value in the 70th percentile C. A data value in the 55th percentile HOLDECO