The removal of the kitten that weighed 57g will affect both the mean and the median.
1. Mean: The mean is calculated by summing up all the values in a data set and dividing it by the number of values. In this case, the removal of the 57g kitten reduces the total weight of the remaining kittens, resulting in a lower sum. As a result, the mean weight of the kittens will decrease.
2. Median: The median is the middle value in a data set when it is arranged in ascending or descending order. With the removal of the 57g kitten, the remaining three kittens still have different weights between 147g and 159g. The median is not affected by the removal of the 57g kitten, as the remaining three values are still in the same order.
In summary, the removal of the 57g kitten will decrease the mean weight of the kittens but will not affect the median weight.