Question 7 [5 points] Below is a histogram detailing percentage grades on a test

Question

Question 7 [5 points] Below is a histogram detailing percentage grades on a test for a class of students. Please answer the questions that follow. For answers that are not whole numbers, please make sure your answers are accurate to 2 decimal places. Frequency 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1 1 6 19 14 10 17 7 4 1 50 55 60 65 70 75 80 85 90 95 100 Student grades a) How many students took the test? 0b) What is the class interval? 0c) What is the class frequency for the 85 up to 90 class? 0d) What is the relative frequency of the 85 up to 90 class? 0e) How many students had a grade less than 70? 0

Explanation / Answer

a) the number of students took the test=41

b) Class interval: Large ammount of data is grouped into several classes are called class intervals

here we take a class intervals with class width 5.

c) the class frequency for 85-90 class is 1

d) relative frequency for 85-90 class is 1/41=0.02439

e) 34 students have less than grade 70.

Class Interval Frequency 0 to 5 9 5-10 8 10-15 6 15-20 7 20-25 0 25-30 0 30-35 0 35-40 0 40-45 0 45-50 1 50-55 1 55-60 1 60-65 1 65-70 1 70-75 1 75-80 1 80-85 1 85-90 1 90-95 1 95-100 1

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