rate of change = (amount of change)/(starting amount)
In this case, that is
(7.5-6.5)/6.5 = 0.1538 = 15.38%
According to a 2010 Kaiser Family Foundation report, during 2009 kids spent almost every waking hour outside of school using electronic devices such as iPhones, computers, or televisions. Those aged 8 to 18 spent an average seven and a half hours a day in 2009 versus six and a half hours in 2004. Calculate the annual average rate of change of electronic use for kids from 2004 to 2009.
1 answer
2 answers