Question 7 {Mandatory} {1 point} Determine the mean age for this set of data. 18-20 0 A] 16 years O B} 564 years 0 C} 16.6 years 0 D] 8.5 years Question 8 (Mandatory) (1 point) Which is a correct summary of this class's marks? Scores on a Math Test 50 55 60 65 70 75 80 85 90 95 100 O A) Q1 = 66, Q3 = 90, Median = 78, IQR = 44 ( B) Q1 = 90, Q3 = 66, Median = 78, IQR = 24 O C) Q1 = 53, Q3 = 97, Median = 78, IQR = 44 ( D) Q1 = 66, Q3 = 90, Median = 78, IQR = 24Question 9 {Mandatory} {1 point} What does a zscore of -2.0 mean? 0 A) The measurement is 2 standard deviations less than the mean. 0 B] The variance cannot be calculated because the zscore is negative. 0 C} There is an error in the measurement. 0 D) The mean is 2 standard deviations less than the measurement. Question 10 {Mandatory} [1 point} Which is a correct statement comparing these data sets? Data Set B m tandard Deviation O A} On average, the data are greater in Set A but are mere spread out in Set B. O B} On average, the data are greater in Set B but are more spread out in Set A. O C} On average, the data are greater in Set B and are mere spread out in Set B. O D) On average, the data are greater in Set A and are more spread put in Set A. Question 11 (Mandatory) (1 point) The self-identified computer expertise level of students in a grade 12 class is shown in the histogram (Newbie, Intermediate, Advanced, Expert, Guru). How many students are in the class? Computer Expertise Level 10 0 N A E GQuestion 12 {Mandatory} (1 point] Customers at a car dealership were sent a survey after the sale. One question read "Did our highly-trained professional sales people satisfy all of your concerns?\" What bias is present in this question? Rewrite the question without bias