Answer:
Nephews= 7.75
Nieces=8.1
Down below is how you slove this :)) Hope it helps
Explanation:
How you find the answer is first you add the total amount of nephews together than the nieces. you then count how many there are so like for nephews there are 4,10,8,9 so when you count them that is 4 so when you add 4,10,8,9 together you divide that by 4 since there are for then you do the same with nieces 5.4,10,8,9 and you get 32.4 then you divide that by 4 because there are 4 and you get 8.1 so the average age of nieces is 8.1 and nephews is 7.75