psychology professor assigns letter grades on a test according to the folowing A

Question

psychology professor assigns letter grades on a test according to the folowing A: Top 9 % ofscores Scores below the 9% and above the bottom 58% C:Scores below thetop 42% ard abovethe bottom 15 % D: Scores below the top 85 % ad above the boner-9% F:Bottom 9% of scores Scores on the test are normually distributed with a mean of 74.6 and a standard deviation of 7.8. Find the numerical amits for a D grade Round you answers to the nearest whole number, if necessary Answer 2 Poines If you would like to look up the value in a table select the table you want so view, then either click the cell at the incersection of the row and colurmno use the anrow keys to ind the appropeiste cellin the table and select it using the Space key. Note: Selecting a cell will neturn the value associated wth the column and row headers for that cell Normal Table 0 to 2 Nonnal Tabe Normal Tableto 7

Explanation / Answer

here for 9 th and 15 th percentile z score =-1.3408 and -1.0364

hence corresponding scores are mean -/+ z*std deviation =64.1 and 66.5

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