The answer your looking for is 33.3%
(it goes on a lot longer but that's just rounded to 1 decimal place)
Answer:
The probability distribution for x:"number of children per family for this income group" is:

Step-by-step explanation:
With the information given we have the relative frequencies of each category.
We know:

178 * 18 + (98-2)
3204 + 96
3300
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wtjfavyw