Understanding Girls Enrollment Data Across Schools

The question asks for the average number of girls enrolled in three schools (A, B, and C) during a specific year, 2019. To find the average, we need to sum the number of girls enrolled in each school for that year and then divide the total sum by the number of schools (which is 3).

First, let's look at the provided table showing the enrollment of girls in schools A, B, and C from 2017 to 2021.

Calculating Average Enrollment in 2019

We are interested in the enrollment data for the year 2019. From the table, we can find the number of girls enrolled in each school for this year:

• School A enrollment in 2019: 275
• School B enrollment in 2019: 150
• School C enrollment in 2019: 199

To find the total enrollment in 2019 across all three schools, we add these numbers:

Total enrollment in 2019 = Enrollment in School A + Enrollment in School B + Enrollment in School C

Total enrollment in 2019 = \(275 + 150 + 199\)

Total enrollment in 2019 = \(624\)

Now, to find the average enrollment, we divide the total enrollment by the number of schools, which is 3.

Average enrollment in 2019 = \(\frac{\text{Total enrollment in 2019}}{\text{Number of schools}}\)

Average enrollment in 2019 = \(\frac{624}{3}\)

Average enrollment in 2019 = \(208\)

So, the average number of girls enrolled in the year 2019 in all three schools is 208.

Summary of Calculation Steps

1. Identify the enrollment figures for the year 2019 for schools A, B, and C from the table.
2. Sum these enrollment figures to get the total enrollment for 2019.
3. Divide the total enrollment by the number of schools (3) to find the average.

Following these steps, we calculated the average to be 208.

Revision Table: Key Concepts Reviewed

Additional Information: Understanding Averages and Data Tables

An average is a single number that represents the central value of a set of numbers. It gives us an idea of a typical value in the dataset. In this case, the average enrollment in 2019 gives us a single figure that summarizes the enrollment trend across the three schools for that specific year.

Data tables are a structured way to organize information. They typically have rows and columns, where rows often represent categories (like years) and columns represent different variables or entities (like schools). Reading a data table involves identifying the row and column that correspond to the specific data point you are looking for. For example, finding the enrollment in School A in 2019 requires finding the row for '2019' and the column for 'A'.

Calculating averages from tables is a common task in data analysis and interpretation. It helps in comparing different sets of data or understanding overall trends.