Let's analyze the production data over the seven days to find out on which day the production exceeds the normal rate of 20 to 22 donuts per hour. Here is the given data:
[tex]\[
\begin{array}{|c|c|}
\hline
\text{Day} & \text{Production (donuts/hour)} \\
\hline
1 & 20 \\
\hline
2 & 22 \\
\hline
3 & 21 \\
\hline
4 & 10 \\
\hline
5 & 15 \\
\hline
6 & 50 \\
\hline
7 & 55 \\
\hline
\end{array}
\][/tex]
The problem states that the normal production rate is between 20 and 22 donuts per hour. We need to identify the first day when the production exceeds 22 donuts per hour.
Let's go through each day:
- Day 1: Production is 20 donuts, within the normal range.
- Day 2: Production is 22 donuts, within the normal range.
- Day 3: Production is 21 donuts, within the normal range.
- Day 4: Production is 10 donuts, which is below the normal range.
- Day 5: Production is 15 donuts, which is below the normal range.
- Day 6: Production is 50 donuts, which exceeds the normal range (greater than 22).
- Day 7: Production is 55 donuts, which also exceeds the normal range.
The first day on which the production exceeds 22 donuts per hour is Day 6.
Thus, the machine appears to make a positive impact on production on Day 6.
