Explanation

A pie graph (or pie chart) is divided into sectors, where each sector represents a part of the whole.

The size of each sector corresponds to the proportion of the category it represents.

Explanation

To find the weighted mean:

Step 1: Calculate the weighted sum

Weighted sum = (18_2) + (19_3) + (20_4) + (21_2) + (22_1) + (23_1) + (24*1)

= 36 + 57 + 80 + 42 + 22 + 23 + 24

= 284

Step 2: Calculate the total weight

Total weight = 2 + 3 + 4 + 2 + 1 + 1 + 1

= 14

Step 3: Calculate the weighted mean

Weighted mean = Weighted sum / Total weight

= 284 / 14

= 20.286

Explanation

The first 10 whole numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

Step 1: Arrange the numbers

The numbers are already in order.

Step 2: Find the median

Since there are 10 numbers (an even count), the median is the average of the 5th and 6th numbers.

5th number = 4

6th number = 5

Median = (4 + 5) / 2

= 9 / 2

= 4.5

Explanation

In a class interval like 7 – 12, the lowest limit is the lower boundary, which is 7.

The upper limit in this case is 12.

Explanation

Class interval is the difference between the upper (or lower) limits of two consecutive classes.

It shows the width of each class in a frequency distribution table.