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We are given that the average of 174 lab readings was initially 70 units. Later, it was discovered that one of the readings, 244, was incorrectly recorded as 70. We need to calculate the correct average.

### Steps:
1. **Find the total sum of all readings based on the incorrect average:**
   \[
   \text{Incorrect sum} = 174 \times 70 = 12,180
   \]

2. **Adjust the sum by correcting the wrongly typed value:**
   The incorrect value is 70, but it should be 244. So, we subtract the incorrect value (70) and add the correct value (244):
   \[
   \text{Corrected sum} = 12,180 - 70 + 244 = 12,354
   \]

3. **Calculate the new average:**
   \[
   \text{Correct average} = \frac{12,354}{174} = 71
   \]

Thus, the correct average is **71**, which matches option (D).

Would you like further details or explanations on any part of this solution?

### Related Questions:
1. How does a change in one reading affect the overall average in a data set?
2. If multiple readings were incorrectly recorded, how would you approach finding the correct average?
3. Can the average change more significantly if the total number of readings is smaller?
4. How would the average change if the reading was incorrectly recorded as a value much higher than the original?
5. What is the impact on the standard deviation when a data point is corrected in a data set?

### Tip:
When solving problems involving averages, adjusting the sum directly based on the correction helps avoid recomputing everything from scratch.

The average of 174 lab readings was 70 units. Later on, it was found that a reading 244 was wrongly typed as 70. Find the correct average.

Discover how to correct the average of lab readings when a misrecorded value is found. This example involves recalculating an average after adjusting a mistaken data entry, ideal for middle school students learning about averages.

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