Final answer:
The mean is found by summing all the data points and dividing by the count; here, we can't calculate it due to incomplete data. The median for an even-sized set is the average of the middle two values after sorting; with hypothetical 7th and 8th values given as 6.8 and 7.2, the median would be 7.
Step-by-step explanation:
John is working on a set of data related to the number of spots on ladybugs. To calculate the mean of the data, one would need to add up all the values and then divide by the number of ladybugs observed. For the median, as there is an even number of observations, the median will be the average of the 7th and 8th values once the data is ordered from smallest to largest.
If the provided table is the entire data set, we would first need to list out all the values in order and then perform the calculations for the mean and median. However, since the complete set of observations isn't provided here, we must rely on the instructions given in the question which imply we should calculate the median between two hypothetical values of a larger data set, specifically the 7th value (6.8) and the 8th value (7.2).
The calculation for the median would be (6.8 + 7.2) / 2 which equals 7. The mean calculation is not possible without the full sum of all values, as the question doesn't provide all necessary data.