---
kind: "section"
citation: "47 C.F.R. § 1.1623"
title: "47"
number: "1.1623"
heading: "Probability calculation."
url: "https://uscodex.org/cfr/47/1.1623"
---

# §1.1623. Probability calculation.

- (a) All calculations shall be computed to no less than three significant digits. Probabilities will be truncated to the number of significant digits used in a particular lottery.
- (b) Divide the total number of applicants into 1.00 to determine pre-preference probabilities.
- (c) Multiply each applicant's pre-preference probability by the applicable preference from § [1.1622 (b)(2)](/cfr/47/1.1622.md?p=b-2) or [(b)(3)](/cfr/47/1.1622.md?p=b-3).
- (d) Divide each applicant's probability pursuant to [paragraph (c)](#c) of this section by the sum of such probabilities to determine intermediate probabilities.
- (e) Add the intermediate probabilities of all applicants who received a preference pursuant to § [1.1622 (b)(2)](/cfr/47/1.1622.md?p=b-2) or [(b)(3)](/cfr/47/1.1622.md?p=b-3).
- (f)
  - (1) If the sum pursuant to [paragraph (e)](#e) of this section is .40 or greater, proceed to [paragraph (g)](#g) of this section.
  - (2) If the sum pursuant to [paragraph (e)](#e) of this section is less than .40, then multiply each such intermediate probability by the ratio of .40 to such sum. Divide .60 by the number of applicants who did not receive a preference pursuant to § [1.1622 (b)(2)](/cfr/47/1.1622.md?p=b-2) or [(b)(3)](/cfr/47/1.1622.md?p=b-3) to determine their new intermediate probabilities.
- (g) Multiply each applicant's probability pursuant to [paragraph (f)](#f) of this section by the applicable preference ratio from [§ 1.1622(b)(1)](/cfr/47/1.1622.md?p=b-1).
- (h) Divide each applicant's probability pursuant to [paragraph (g)](#g) of this section by the sum of such probabilities to determine the final selection percentage.

## Notes

### Authority

Authority: 47 U.S.C. 309(i).

### Source

Source: 48 FR 27202, June 13, 1983, unless otherwise noted.

### Authority

Authority: 47 U.S.C. chs. 2, 5, 9, 13; 28 U.S.C. 2461 note; 47 U.S.C. 1754, unless otherwise noted.