Scores on a test are normally distributed with a mean of 78 and a standard deviation of 6. A student is selected at random. Which has the greatest probability? Select one: O a. The student's score is between 63 and 72. O b. The student's score is greater that 89. O c. The student's score is less than 69. O d. The student's score is between 78 and 81.

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