Returns the LC for n between 0 and 100

1 | ```
CalculateLCn(x, n, r, N = 50)
``` |

`x` |
numeric, log concentration |

`n` |
numeric, number of insects |

`r` |
numeric, number of observed affected |

`N` |
numeric, Lethal Concentration "N" |

the LC for n between 0 and 100

Jose Gama

Finney D. J., 1964 Probit analysis: a statistical treatment of the sigmoid response curve. Cambridge University Press

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