Question textA class of 21 students were asked their age (in years). Their responses are in the EXCEL file ClassAges.xlsx (Download and open this file). Use Excel to calculate the mean age of this group. Give your answer to 2 decimal places. Answer 1 Question 5[input]

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BlackTom AI · Accepted Answer

The task asks for the mean age of 21 students, calculated from the data in ClassAges.xlsx, and to report the result to two decimal places. Since we don’t have the actual data values here, I’ll outline the correct approach and how you would confirm the result in Excel.

First, identify the data range. In Excel, the 21 ages should be in a single column or row, for example A2:A22 or B2:B22. The exact range isn’t provided, so you would select the cells that contain the 21 responses.

Next, compute the mean. The mean (average) is the sum of all ages divided by the number of observations. In Excel you have two straightforward options:
- Use the AVERAGE function. For example, if the ages are in A2:A22, enter =AVERAGE(A2:A22) in a blank cell. Excel will return the mean of those 21 numbers.
- Alternatively, use the status bar. If you highlight the 21 cells, Excel often shows the average (mean) in the status bar at the bottom, which gives a quick check without inserting a formula.

Then, ensure the result is presented to 2 decimal places. If the formula returns a longer number, you can format the cell to display two decimals:
- Right-click the result cell, choose Format Cells, select Number, and set Decimal places to 2.
- Or use a rounding function such as =ROUND(AVERAGE(A2:A22), 2) to explicitly round the mean to two decimals.

Potential pitfalls and checks:
- Make sure you’re summing the correct 21 responses and not including any header text or empty cells.
- If any of the ages are entered as text (e.g., "19" vs 19), Excel will usually coerce them, but it’s good practice to verify data types to avoid erroneous results.
- If any cells contain non-numeric values or missing data, decide whether to treat them as zeros, ignore them, or impute values. In standard mean calculation, missing data are typically ignored, which is what AVERAGE does by default when blank cells are present.
- Round off: reporting to two decimals means either rounding the computed mean or truncating depending on instructions. The typical method is standard rounding (ROUND to 2 decimals).

If you already have a candidate answer of 19.29, you can verify it by redoing the calculation:
- Compute the sum of all 21 ages and divide by 21.
- Round the result to two decimals. If the computed value matches 19.29 after rounding, then the answer is consistent with the data provided.

Summary of the exact steps you’d execute in Excel:
1) Select the 21 age cells (e.g., A2:A22).
2) Enter =AVERAGE(A2:A22) in a blank cell to obtain the mean.
3) If needed, wrap with =ROUND(AVERAGE(A2:A22), 2) to force two-decimal formatting.
4) Format the result cell to display two decimals for consistent presentation.

Without the actual data values, we can’t independently confirm the numeric result, but following these steps will reproduce the mean to two decimals as required.

Question textA class of 21 students were asked their age (in years). Their responses are in the EXCEL file ClassAges.xlsx (Download and open this file). Use Excel to calculate the mean age of this group. Give your answer to 2 decimal places. Answer 1 Question 5[input]

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