For a given sample size, returns the largest fraction which has been sampled with p x 100

1 | ```
get.f(n, p = 0.05)
``` |

`n` |
the number of grains in the detrital sample |

`p` |
the required level of confidence |

the largest fraction that is sampled with at least 100 x p certainty

Vermeesch, Pieter. "How many grains are needed for a provenance study?." Earth and Planetary Science Letters 224.3 (2004): 441-451.

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