Final answer:
Tammy's percent error in the estimate of the number of bottles sold is approximately 14.3%, calculated using the percent error formula and rounding to the nearest tenth.
Step-by-step explanation:
The student asked how to calculate the percent error in an estimate of the number of bottles sold. Tammy predicted she would sell 300 bottles of water but actually sold 350. To find the percent error, we use the formula: Percent Error = (|Estimated Value - Actual Value| / Actual Value) × 100%. Substituting the given values we have: Percent Error = (|300 - 350| / 350) × 100% = (50 / 350) × 100% = 0.142857 × 100% ≈ 14.3%. So, Tammy's percent error in her estimate is approximately 14.3% when rounded to the nearest tenth.