GRADING ON A CURVE Dr. Smith, a biology professor at Bradford University, has de

Question

GRADING ON A CURVE Dr. Smith, a biology professor at Bradford University, has decided to give his classes a standardized biology exam that is nationally normed. This indicates that the normal distribution is an appropriate approximation for the probability distribution of students' scores on this exam. The probability distribution of students' scores on this standardized exam can be estimated using the normal distribution shown below nflection Point nflection Point 70 78 86 State the mean and the standard deviation of the distribution of the biology exam scores

Explanation / Answer

here as we know that due to symmetry ; mean should be at center therefore mean=78

also as inflection points are 1 std deviaiton from mean ; therefore std deviation =86-78=8

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