Answer:
Step-by-step explanation:
Here's a Python program that takes input lines one at a time, prints each line of data, and calculates the highest mean, lowest mean, and mean of the means:
```python
# initialize variables
highest_mean = float('-inf')
lowest_mean = float('inf')
total_mean = 0
count = 0
# input lines one at a time
while True:
try:
line = input()
except EOFError:
break
# print each line of data
print(line)
# calculate mean of current line
nums = [float(num) for num in line.split()]
mean = sum(nums) / len(nums)
# update highest and lowest means
highest_mean = max(highest_mean, mean)
lowest_mean = min(lowest_mean, mean)
# update total mean and count
total_mean += mean
count += 1
# calculate mean of the means
mean_of_means = total_mean / count
# print results
print('Highest mean:', highest_mean)
print('Lowest mean:', lowest_mean)
print('Mean of the means:', mean_of_means)
```
To use this program, simply run it in a Python environment and input the lines of data one at a time. The program will print each line of data, followed by the highest mean, lowest mean, and mean of the means.