Posted by **Chelsea** on Thursday, February 26, 2009 at 5:57pm.

The mean of five numbers is 60. Four of the numbers are 50, 60, 40, and 80. What is the fifth number.

- 4th grade math -
**Mr. L.**, Thursday, February 26, 2009 at 6:01pm
Mean is the average of a set of numbers. So add and divide by the number of digits you added. This is little different. Let see here....50+60+40+80=230 / 4 = 57.5 close....hmmmm....Trial and error...230+60=300 / 5 =

- 4th grade math -
**drwls**, Thursday, February 26, 2009 at 6:01pm
Hint: The sum for the five numbers will have to be 300 if the mean is to be 60.

With the first four numbers, the sum is 230. What do you have to add to that to get 300?

- 4th grade math -
**Mr. L.**, Thursday, February 26, 2009 at 6:03pm
oops i meant 230 + ? = 300 /5 = 60

- 4th grade math -
**Chelsea**, Thursday, February 26, 2009 at 6:06pm
Thank you

- 4th grade math -
**caitlin**, Tuesday, March 3, 2009 at 4:07pm
133devided by14

- 4th grade math -
**Jermaine**, Tuesday, March 3, 2009 at 10:31pm
how to write a sum in simplest form.

- 4th grade math -
**nancy**, Tuesday, April 14, 2009 at 5:27pm
21

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