What version of Go are you using (go version)?

$ go version
go version go1.14.7 linux/amd64

Does this issue reproduce with the latest release? Yes

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN="/home/vj0r/GOLANG/bin"
GOCACHE="/home/vj0r/.cache/go-build"
GOENV="/home/vj0r/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/vj0r/GOLANG"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/lib/go-1.14"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.14/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build355855424=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Provide code that calculates the average of the floating point numbers read from a file
If the file with numbers of size 50M the count is performed flawlessly. And the values are the same from other programming languages.
If the file is 245M in size, then Go does not count correctly. Most likely, there is an accumulation of errors.

File from go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
)

func main() {

	file, err := os.Open("./file")
	panicm(err)
	read := bufio.NewScanner(file)
	var sum float32 = 0
	var i int = 0
	for read.Scan() {

		res := strings.TrimSpace(read.Text())
		r1, err := strconv.ParseFloat(res, 32)
		panicm(err)
		sum += float32(r1)
		i++
	}

	err = file.Close()
	panicm(err)

	fmt.Printf("%F\n", sum/float32(i))
}

func panicm(err error) {
	if err != nil {
		log.Panic(err)
	}
}

file with numbers like:

$ cat file
56.2
89.5
71.8
56.2
......

$ du -sh file
245M	file

go build loadfile.go 
$ ./loadfile 
101.770912

$ perl -e 'open(fd,"file"); $sum=0; $i=0; while(){$sum+=$_; $i++} print $sum/$i'
150.811212282527

$awk 'BEGIN {sum=0; count=0} {sum+=$1; count++} END{print sum/count}' file
150.811

$ cat loadfile.py
#!/usr/bin/python3
f = open("./file")
sum=0
i=0
for ch in f.readlines():
    sum+=float(ch)
    i+=1
print(sum/i)

$ ./loadfile.py
150.8112122825271

What did you expect to see?

150.811212

What did you see instead?

101.770912