A city planning commission is considering revamping the traffic system of the city. Help them by calculating

Question:

A city planning commission is considering revamping the traffic system of the city. Help them by calculating the mean and standard deviation of the following data regarding automobile ownership by city residents.
Number of Automobiles Owned Number of Residents
0………………………………….. 199
1………………………………….. 491
2………………………………….. 350
3………………………………….. 128