@misc{indiciae22e343eeceeb,
  title = {Statistics at square one. II--Mean from frequency distribution.},
  author = {T D Swinscow},
  year = {1976},
  doi = {10.1136/bmj.1.6021.1325},
  url = {https://pubmed.ncbi.nlm.nih.gov/1268681/},
  note = {Source identifier: 1268681}
}