Answer
Conclusion about accuracy- Not accurate
Conclusion about precision- Are precise
Work Step by Step
Results are not accurate as they are not close to the actual amount of calcium in the sample.
Results are precise as they are close to each other. To establish this let us calculate the average of results-
Average = $\frac{14.92 + 14.91 + 14.88 + 14.91}{4} $
Average = $\frac{59.62}{4} \approx 14.91 $
Thus results are close their average value, hence they are precise.
