Here are the total scores of 10 students in an introductory statistics course. 62935476739864558071Previous experience with this course suggests that these scores should come from a distribution that is approximately Normal with mean 72 and standard deviation 10. The grading policy says that the cutoffs for the other grades correspond to the following: bottom 5% receive F, next 15% receive D, next 40% receive C, and next 30% receive B. These cutoffs are based on the N(72, 10) distribution.(a) Give the cutoffs for the grades in this course in terms of standardized scores. (Round your answers to two decimal places.) Letter Grade    Standardized CutoffF       z <D   < z < C   < z < B   < z <

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Asked Feb 3, 2020
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Here are the total scores of 10 students in an introductory statistics course.
 
62 93 54 76 73 98 64 55 80 71

Previous experience with this course suggests that these scores should come from a distribution that is approximately Normal with mean 72 and standard deviation 10. The grading policy says that the cutoffs for the other grades correspond to the following: bottom 5% receive F, next 15% receive D, next 40% receive C, and next 30% receive B. These cutoffs are based on the N(72, 10) distribution.

(a) Give the cutoffs for the grades in this course in terms of standardized scores. (Round your answers to two decimal places.)
 
Letter Grade    Standardized Cutoff
     z <
D   < z < 
C   < z < 
B   < z < 
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Step 1

(a)

 

From the given information, the cutoffs for the grade F is 5%. That is, z<0.05.

 

From the Standard Normal Table, Area to the left of z=0.05 is –1.64 or –1.65.

 

From the given in...

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