To calculate the average time it took for the tablet to dissolve in room temperature water, you need to sum the times from all trials and then divide by the number of trials.
Given the times:
- Trial 1: 150.00 seconds
- Trial 2: 252.00 seconds
- Trial 3: 351.00 seconds
First, sum the times:
\[ 150.00 + 252.00 + 351.00 = 753.00 \text{ seconds} \]
Now, divide the total by the number of trials (which is 3):
\[ \text{Average time} = \frac{753.00 \text{ seconds}}{3} = 251.00 \text{ seconds} \]
So, the average time it took for the tablet to dissolve in room temperature water is 251.00 seconds.