calculate.go

package main

import (
	"fmt"
	"net/http"
	"encoding/json"
)

func main()  {
	req, _ := http.NewRequest("GET", "https://api.clever.com/v1.1/sections", nil)
	req.Header.Set("Authorization", "Bearer DEMO_TOKEN")
	client := http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()

	var f interface{}
	if err := json.NewDecoder(resp.Body).Decode(&f); err != nil {
		fmt.Println(err)
		return
	}

	n := f.(map[string]interface{})["data"].([]interface{})
	total := 0
	for _, v := range n {
		total += len(v.(map[string]interface{})["data"].(map[string]interface{})["students"].([]interface{}))
	}
	fmt.Println(float32(total)/float32(len(n)))
}