As the US stocks continue to tumble as a direct result of Trump's policies, we're starting to see a little bit of damage ...
Image caption, To find the mean age, use a calculator to divide the total age of all the children (168) by how many children there are (15). 168 ÷ 15 = 11.2. The mean age is 11.2 years old.
The Ark Innovation ETF is down 17% year-to-date.