Answer
Without tank:
Mean=94.6
Median=94.5
Mode=none
Range=19
With tank:
Mean=109.6
Median=109.5
Mode=no mode
Range
Work Step by Step
Without tank: The values are 85,88,91,95,97,103,104:
-->The mean is the average of the data. So add all the values and divide by 8. The mean is 94.6
-->The median is the middle values. the middle values are 94 and 95 so you take the average and that is the median. (94+95)/2=94.5.The median is 94.5
-->The mode is the number that occurs most often. There is no mode.
-->The range is the difference between the largest and the smallest value:104-85=19. The range is 19.
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With tank: Add 15 to the mean, median and mode. The range stays the same:
-->Mean:94.6+15=109.6
-->Median:94.5+15=109.5
-->Mode=No mode
-->Range=19
