Looking for some help. A sample of 100 adult women was taken, and each was asked how many children she had. The results were as follows:
Children: 0 1 2 3 4 5
Women: 27 22 30 12 7 2 respectively
a. Find the sample mean number of children
b. Find the sample standard deviation of the number of children.
For a. my initial answer is 1.56 since there are 156 total children among the 100 women but then I ran into issues trying to figure the deviation. Any assistance would be appreciated.

Question

Looking for some help. A sample of 100 adult women was taken, and each was asked how many children she had. The results were as follows:
Children: 0 1 2 3 4 5
Women:  27 22 30 12 7 2 respectively
a. Find the sample mean number of children 
b. Find the sample standard deviation of the number of children.
For a. my initial answer is 1.56 since there are 156 total children among the 100 women but then I ran into issues trying to figure the deviation. Any assistance would be appreciated.