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3 May 2022
A psychology teacher gave an objective-type test to a class of 400 students and, after seeing the results, decided that the scores were normally distributed. The mean score was 49, and the standard deviation was 14. The teacher assigned a grade of A to all scores of 77 or over, B to scores of 63 to 76, C to scores of 35 to 62, D to scores of 21 to 34 and F to scores below 21. About how many of each grade did the teacher assign? (Round your answers to the nearest whole number. Due to rounding, values may not add to the given sum, Recall that 34% of z-scores lie between 0 and 1, 13.5% lie between 1 and 2, and 2.5% are greater than 2.)
A
B
C
A psychology teacher gave an objective-type test to a class of 400 students and, after seeing the results, decided that the scores were normally distributed. The mean score was 49, and the standard deviation was 14. The teacher assigned a grade of A to all scores of 77 or over, B to scores of 63 to 76, C to scores of 35 to 62, D to scores of 21 to 34 and F to scores below 21. About how many of each grade did the teacher assign? (Round your answers to the nearest whole number. Due to rounding, values may not add to the given sum, Recall that 34% of z-scores lie between 0 and 1, 13.5% lie between 1 and 2, and 2.5% are greater than 2.)
A
B
C
