only prints things out in verbose mode

given a vector of values and a vector of weights, compute the weighted mean

1 | ```
weighted.mean(x, w, na.rm = FALSE)
``` |

`x` |
the vector of values |

`w` |
the vector of weights |

`na.rm` |
if TRUE, only consider elmeents of x that are not missing (and their corresponding entries in w). Defaults to FALSE. |

the weighted mean

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