find the standard deviation of all keys in a map in go

main.go
package main

import (
    "fmt"
    "math"
    "math/rand"
    "sort"
    "strconv"
    "time"
)

func main() {
    // Create a map with random key-value pairs
    rand.Seed(time.Now().UnixNano())
    testMap := make(map[string]int)
    for i := 1; i <= 10; i++ {
        testMap[strconv.Itoa(i)] = rand.Intn(100)
    }

    // Extract keys from the map and store them in a slice
    keys := make([]int, 0, len(testMap))
    for key := range testMap {
        i, err := strconv.Atoi(key)
        if err != nil {
            panic(err)
        }
        keys = append(keys, i)
    }

    // Calculate the mean of the slice
    var sum int
    for _, value := range keys {
        sum += value
    }
    mean := float64(sum) / float64(len(keys))

    // Calculate the variance of the slice
    var variance float64
    for _, value := range keys {
        variance += math.Pow(float64(value)-mean, 2)
    }
    variance /= float64(len(keys))

    // Calculate the standard deviation of the slice
    stdDev := math.Sqrt(variance)

    fmt.Printf("The standard deviation of the keys in the map is %.2f\n", stdDev)
}
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