Answer:
Image 1 - The Range lies in (20,84)
Image 2-
Arranging the numbers in ascending order:
3, 3, 3, 3, 4, 5, 7, 7, 9
There are nine numbers in total, so we have an odd number of values. The middle number is the fifth number, which is 4.
Therefore, the median of the given set of numbers is 4.
Image 3- sorry I didn't understood the question properly
Image 4- To calculate the sum of the products:
Sum = (65 * 6) + (70 * 4) + (75 * 6) + (80 * 7) + (85 * 1) + (90 * 4)
Sum = 390 + 280 + 450 + 560 + 85 + 360
Sum = 2125
Now, let's calculate the total number of students:
Total students = 6 + 4 + 6 + 7 + 1 + 4
Total students = 28
To find the mean:
Mean = Sum / Total students
Mean = 2125 / 28
Mean ≈ 75.893
Therefore, the mean score, rounded to three decimal places, is approximately 75.893.