Learn how to query the HTTP Archive's BigQuery dataset: https://github.com/HTTPArchive/legacy.httparchive.org/blob/master/docs/bigquery-gettingstarted.md

Median, Average, and p90th Image Request Size from HTTP Archive

/**
 * Obtained from the HTTP Archive's BigQuery dataset.
 * Dataset table name: httparchive.summary_requests.2018_04_15_desktop
 * BigQuery guide: https://bit.ly/2wpdyOV
 **/

{
  "type": "image",
  "format": "jpg",
  "Requests": "9153030",
  "Median": "19.0586",
  "Average": "57.5388",
  "Pct90th": "108.085"
} {
  "type": "image",
  "format": "png",
  "Requests": "3284588",
  "Median": "16.2588",
  "Average": "69.1363",
  "Pct90th": "134.1543"
} {
  "type": "image",
  "format": "webp",
  "Requests": "128766",
  "Median": "17.9063",
  "Average": "33.8564",
  "Pct90th": "59.6865"
}