A socikotings professor assigns letter grades on a test according no the foilowi

Question

A socikotings professor assigns letter grades on a test according no the foilowing scheme A: Top 11 % ers:ores ascer es trow the top" 1nd abor the boron 60 % c scans below the Sep 40% and ebove the bettom 24 aseres below the rop 76% and above the boom 7 % F: Ben om 7 % or scores Sceres on the trest are narmaly dstribued with a mean of 0.2 and a standard deviation af9.6. find the numencal ts for a D grade. Round your answe's to the nearest whole number df recessary nnwer Poin you wauld ise o look up tme saue n a table silect the colurn and row headers fer hat Keypad the table you wont ta ew. then ether cick tne cel at the intersection of the row and column or Space key Note: Selecting a cetl wil reurn the vale associated weh use the arrow knys to find tive appopriate cet in the tabie and select it using the c Next and Norma Table O to z Namal Table Normal Tabie-t

Explanation / Answer

Z= (x-u)/

P(0.07 to 1-0.76)

Z value corresponding to 0.07, Z1 = -1.475

Z value corresponding to 0.24, Z2 = -0.71

X= u + z*

x1 = 70.2 + (-1.475)*9.6 = 56.04

x2 = 70.2 + (-0.71)*9.6 = 63.4

Thus, 56.04 to 63.4

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