we have the data set
-54,-43,-28,34,62
step 1
Adds the five temperatures
so
S=(-54-43-28+34+62)
S=-29 degrees
step 2
Divide the sum of step 1 by the number of values
we have five temperatures
so
-29/5=-5.8 degrees
therefore
the average temperature for these five days was -5.8 degrees Fahrenheit