A table with highs and lows calls for selecting one row before calculating. The mean is the total of the chosen readings divided by how many readings there are. Enter that row as a Desmos list, then use to find the mean. Combining both rows averages different data, not the data requested.
Hints
- Hint 1
The word low points to one row of the table. Take one reading from that row for each day; the high temperatures don't belong in the calculation.
- Hint 2
A mean shares the total evenly among the readings you selected, so every day's low counts once. Put the five lows in a Desmos list, then find the mean of that list.
Step-by-step
Use a Desmos list for the lows
Step 1Select the low temperatures
The question asks for low temperatures, so read that row across the five days: . Use only the row the question names. The highs describe different readings.
- Step 2
Enter the five readings
Type in Desmos. It shows a five-number list named , matching the five days. Check the entries against the low row before calculating.
- Step 3
Find the mean low temperature
Type . Desmos shows : it adds the five lows and divides by . So the mean low temperature was degrees Fahrenheit. Keep the decimal because the question doesn't ask you to round. Choice D.