A survey recorded the number of children 18 years old or younger who lived in 500 households. The accompanying table shows the results. a. Determine the mean number of children per household. b. Determine the standard deviation for the number of children per household.	Number of Children	Number of Families
0	213
1	101
2	110
3	45
4	24
5	7

a. The mean number of children per household is

nothing.

(Round to three decimal places as needed.)

b. The standard deviation for the number of children per household is

nothing.

(Round to three decimal places as needed.)