Answer
If it says = 90 at the end it means that's the answer.
The Standard deviation could only be zero if all the data points in your set are equal. If all data points are equal, there is no deviation.
3x+10y+5 I think that’s the answer.
3+6+4=13 songs
Rap Probability: 3/13
Country Probability after the first song: 6/12
3/13*1/2=3/26
