1) The mean of  4 numbers is 5. Three of the numbers are 3, 5 and 8. What is the fourth number?

2) I think of three numbers.

The mean is equal to the mode and this is equal to 4.

Find ALL the possible sets of 3 numbers.

Guest Apr 4, 2017

Since the mean(average) of 4 numbers is 5, it therefore follows that they total: 5 x 4 =20.

20 -(3+5+8) =4 - which is the fourth number.


The mode is the most frequent number. And since the mode = the mean =4, I can only think of one set of three numbers, which is:4, 4, 4.

Guest Apr 4, 2017

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