Time for 20 oscillations of a pendulum is measured as `t_1 = 39.6 s , t_2 = 39.9 s , t_3 = 39.5.` What is the precision in the measurements ? What is the accuracy of the measurement ?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the Precision
Precision is defined as the smallest unit of measurement that can be reliably read from the measuring instrument. In this case, we can determine the precision by looking at the readings.

**Given Readings:**
- \( t_1 = 39.6 \, s \)
- \( t_2 = 39.9 \, s \)
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