To find the mode of the number of fire hydrants on each street, we first need to convert the tally marks into numerical values. Here's the breakdown for each street:
- Maple Street: 5 + 5 + 5 + 3 = 18 hydrants
- Lemon Street: 5 + 5 + 5 = 15 hydrants
- Pine Street: 5 + 5 + 5 = 15 hydrants
- Elm Street: 5 + 5 + 5 + 3 = 18 hydrants
- Fir Street: 5 + 5 + 5 + 3 = 18 hydrants
- Aspen Street: 5 + 5 + 5 + 5 = 20 hydrants
- Rose Street: 5 + 5 + 5 + 3 = 18 hydrants
- Oak Street: 5 + 5 + 5 + 5 = 20 hydrants
Now, listing the total numbers from above:
- Maple Street: 18
- Lemon Street: 15
- Pine Street: 15
- Elm Street: 18
- Fir Street: 18
- Aspen Street: 20
- Rose Street: 18
- Oak Street: 20
Now we can list the frequencies of the counts:
- 15 appears 2 times (Lemon, Pine)
- 18 appears 4 times (Maple, Elm, Fir, Rose)
- 20 appears 2 times (Aspen, Oak)
The mode is the number that appears most frequently. In this case, 18 appears the most (4 times).
Thus, the mode of the number of fire hydrants is 18.