What is the mean for this set of data?

, ,

John would like to have a 90 average for math for this semester. John received a 78, 89, 100 on three of his tests. What is the lowest grade he could receive on his last test in order for him to get a 90 average for the semester?

Veronica went to the mall and bought several small gifts for her sister's birthday. The prices of the items were the following:

$8, $10, $6, $3, $7, $10, $2, $5, $3

What is the mean price?

Determine the mean of the numbers:

Find the mean of the numbers:

Determine the mean of the numbers:

Determine the mean of the numbers:

In order for Joseph to pass his math class, he must have an average test score of . On his past four math tests he received the following scores: . What must he score on his fifth and final test in order to pass the class?

Determine the mean of the numbers:

There are nine people in an elevator. They have an average weight of lbs. Two more people enter the elevator. They have an average weight of lbs. What is the new average weight of the group in the elevator? Round to the nearest hundredth of a pound.