The Scores for 197 students on a 200-point exam with 26 questions; so there is a

Question

The Scores for 197 students on a 200-point exam with 26 questions; so there is a bonus question and they can actually score 208 if they get them all correct. The scores have been sorted from low to high and n = 197.

(I also figured these out):

#1: What does the height of each bar in the histogram represent? A)The frequency of the corresponding class B) The mean of all data values iin the corresponding class C)The cumulative frequency of each class D) The midpoint of the data range in the corresponding class

#2: The range of these data is: A) 160 B) 15 C) 192 D) 168

#3: The number of students who took this exam is: A) 208 B) 224 C) 15 D) 197

#4: Treating these as Discrete Data the width of each class is: A) 8 B) 10 C) 9 D) 5

#5: The coefficient of variation for the set of data is: A) 20.5 B) 9.7% C) 32.9 D) 73.0%

#6: The releative frequency of the 11th class is: A) 33.4% B) 55.6% C) 16.2% D) 11.0%

#7: The scores on this exam are an example of: A) Qualitative B) Nominal level of measurement C) Ratio level of measurement D) Ordinal level of measurement

#8: What the cumulative relative frequency of the 7th class?: A) 20.8% B) 7.0% C) 22.0% D) 11.4%

#9: What % of the students received a score of (less than, or equal to) > 130?

#10: The sample variation is: A) 31552.0 B) 32.9 C) 1081.4 D) 168.3

Thank you!

Explanation / Answer

#1: What does the height of each bar in the histogram represent?

A)The frequency of the corresponding class

#2: The range of these data is: D) 168

#3: The number of students who took this exam is: D) 197

#4: Treating these as Discrete Data the width of each class is: B) 10

#5: The coefficient of variation for the set of data is: A) 20.5

Coefficient of Variation = Standard deviation / Mean = 32.88529865/160.1624365 = 20.53 %

#6: The relative frequency of the 11th class is: C) 16.2%   

Relative frequency of 11th class =32/197

#7: The scores on this exam are an example of: C) Ratio level of measurement

#8: What the cumulative relative frequency of the 7th class?: A) 20.8%

Cumulative relative frequency of 7th class =(22+7+3+3+3+1+2)/197

#9: What % of the students received a score of (less than, or equal to) > 130?

Same as #8 , i.e. 20.8 %

#10: The sample variation is: C) 1081.4

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