The temperatures (in ° F) in a city on randomly selected days during the summer are 89, 85, 90, 87, 86, 91, 88, and 89. What is the mean temperature? Round your answer to one decimal place.
To find the mean, we need to sum up all the temperatures and then divide by the number of temperatures (8).
$89+85+90+87+86+91+88+89 = 705$
$\Rightarrow \frac{705}{8}=88.125$
Rounded to one decimal place, the mean temperature is $\boxed{88.1}$ degrees Fahrenheit.