Question

Determine Mean, Median and IQR

Here are the shoe sizes of some grade 9 and grade 12 students.
Grade 9 shoe sizes:
[6,8,6.5, 7.5, 7,6.5, 9, 6, 8.5, 7.5, 8, 10, 11, 8, 9]
Grade 12 shoe sizes:
[10, 9, 10.5, 8.5, 10, 9, 9.5, 8, 8, 11, 9, 9.5, 11, 10.5, 8.5]
8 1 point
What is the mean of the grade 9 shoe sizes?

Answer 1

The mean of grade 9 is 7.9
Because you add all of the numbers up then divide it by the amount of numbers
The total of the numbers is 118.5
118.5/15 = 7.9

Answer 2

The mean of the grade 9 shoe sizes is the average of all the shoe sizes in the data set. To find the mean, we can add up all the shoe sizes and divide by the number of shoe sizes. The formula for the mean is:

mean=n∑x

where x is a shoe size and n is the number of shoe sizes. Using this formula, we can calculate the mean of the grade 9 shoe sizes as follows:

mean=156+8+6.5+7.5+7+6.5+9+6+8.5+7.5+8+10+11+8+9

mean=15118

mean=7.87

Therefore, the mean of the grade 9 shoe sizes is 7.87.