Question 1176382
if it is a normal distribution, then the mean is equal to the median is equal to the mode.


therefore, the mean and the median and the mode are all equal to 20.


here's a reference.


<a href = "https://onlinestatbook.com/2/normal_distribution/intro.html#:~:text=Normal%20distributions%20are%20symmetric%20around,less%20dense%20in%20the%20tails." target = "_blank">https://onlinestatbook.com/2/normal_distribution/intro.html#:~:text=Normal%20distributions%20are%20symmetric%20around,less%20dense%20in%20the%20tails.</a>