如何在Golang中将[] string转换为[] float64？

I'm new to programming, and trying to write a simple average program in Go.

package main

import (
    "fmt"
    "os"
)

var numbers []float64
var sum float64 = 0

func main() {

    if len(os.Args) > 1 {

        numbers = os.Args[1:]

    }

    fmt.Println("Numbers are: ", numbers)
    for _, value := range numbers {
        sum += value
    }

}

when I build the program, I got this error:

prog.go:15: cannot use os.Args[1:] (type []string) as type []float64 in assignment
[process exited with non-zero status]

So how to convert a slice of string to a slice of float numbers? Can I map a convert function to the slice?