i don't understand this problem

How can I calculate the median if I only have a frequency table and not the original data? Apply this to the following example, which represents the number of siblings of students in a class: - there Oh brothers 0.167 0. 167 1 brother 0.333 0.500 2 brothers 0.222 0.722 3 brothers 0.167 0.889 4 brothers T 0.056 0.944 5 brothers 0.056 1,000 1,000