function plusMinus(arr) {
    let pos = 0, neg = 0 , zero = 0 , length = arr.length
    arr.forEach( n => {
        if( n > 0 )
            pos++
        else if( n < 0 )
            neg++
        else
            zero++
    } )
    console.log( (pos / length).toFixed(6) )
    console.log( (neg / length).toFixed(6) )
    console.log( (zero / length).toFixed(6) )
}