Hans works as a tutor for $8 an hour and as a waiter for $10 an hour. This month, he worked a combined total of 97 hours at his two jobs.
Let t be the number of hours Hans worked as a tutor this month. Write an expression for the combined total dollar amount he earned this month.

he earned $97.02 in one month

Step-by-step explanation:

In order to the get the mean, you will have to add all of the values and then divide your answer by how many values there are. 

Let's add our values: 
78+79+80+80+89+89+92+93+94+95+95+95 = 1059. 

There are 12 values. So...:
1059/12 = 88.25. It says to round to the nearest tenth. That would be 88.3.