An examination is frequently regarded as being designed good if the test scores

Question

An examination is frequently regarded as being designed good if the test scores of those taking the examination is bell-shaped or normally distributed. f the test scores follows a normal distribution with mean equal to and variance equal to 2, the instructor often assigns the letter grade A to those whose test score is greater than + B to those whose score is between and + , C to those whose score is between - and , D to those whose score is between -2 and -, and F to those getting a score below -2. (This strategy is sometimes referred to as grading "on the curve."). Approximately what percentage of class will receive an A grade on the examination? 15% o 16% o 17% o 18% UESTION 11 Approximately what percentage of class will receive an C grade on the exa- mination? 32% O 33% o 34% o 35%

Explanation / Answer

1)here as 16% values are more than 1 std deviation from mean

hence 16% is correct

11)

as 34% are between 1 std deviation below mean and mean

hence 34% are correct,

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