Chapter 6 Project a Grades Using a Normal Distribution abiology professor at Bra
ID: 3371158 • Letter: C
Question
Chapter 6 Project a Grades Using a Normal Distribution abiology professor at Bradford University, has decided to give his classes a standardized that is nationally normed. This indicates that the normal distribution is an appropriate hiole etin for the probability distribution of students' scores on this exam. The probability f students' scores on this standardized exam can be estimated using the normal Dr y exam stribution shown below Inflection Point inflection Point 70 78 86 State the mean of the distribution of the biology exam scores. , State the standard deviation of the distribution of the biology exam scores. Grading Curve Option I Oiginally, Dr. Smith decides to curve his students' exam grades as follows. . Students whose scores are at or above the 90h percentile will receive an A. . Students whose scores are in the 80h-89th percentiles will receive a B. Students whose scores are in the 70h-79th percentiles will receive a C. Students whose scores are in the 60th -69 percentiles will receive a D. Students whose scores are below the 60th percentile will receive an F . Find the z-scores that correspond to the following percentiles 90h percentile 80h percentile 70* percentile 60 percentile e exam scores range from 0 to 100. (Round to the nearest whole number.) A: B: dsing that information, find the exam scores that correspond to the curved grading scale. Assume -100 D: 6 0- 377Explanation / Answer
Project a Grades Using a Normal Distribution abiology professor at Bradford University, has decided to give his classes a standardized that is nationally normed. This indicates that the normal distribution is an appropriate hiole etin for the probability distribution of students scores on this exam. The probability f students scores on this standardized exam can be estimated using the normal Dr y exam stribution shown below Inflection Point inflection Point 70 78 86 State the mean of the distribution of the biology exam scores. , State the standard deviation of the distribution of the biology exam scores. Grading Curve Option I Oiginally, Dr. Smith decides to curve his students exam grades as follows. . Students whose scores are at or above the 90h percentile will receive an A. . Students whose scores are in the 80h-89th percentiles will receive a B. Students whose scores are in the 70h-79th percentiles will receive a C.