Growing families

What do these statistics about family size mean?
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Problem



The table shows some information about family sizes.

Number of children 1 2 3 4 5
Number of families 6 13 9 4 1

Find:

a) the mean number of children in a family

b) the mean number of siblings that each child has

 

If you liked this problem, you might also like the longer problem it is based on, The Wrong Stats