The mean of a set of decimals

Difficulty Stretch · Set ipivqd

Give each mean to two decimal places.

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
Find the mean of 1.75, 9.35, 0.05, 0.05, 0.05.
2
Find the mean of 10.80, 0.05, 0.05, 0.05, 0.05.
3
Find the mean of 2.40, 7.70, 0.05, 0.05, 0.05.
4
Find the mean of 10.30, 0.05, 0.05, 0.05, 0.05.
5
Find the mean of 3.50, 6.85, 0.05, 0.05, 0.05.
6
Find the mean of 12.05, 0.05, 0.05, 0.05, 0.05.
7
Find the mean of 10.55, 0.05, 0.05, 0.05, 0.05.
8
Find the mean of 7.90, 3.95, 0.05, 0.05, 0.05.
9
Find the mean of 10.80, 0.05, 0.05, 0.05, 0.05.
10
Find the mean of 11.05, 0.05, 0.05, 0.05, 0.05.
11
Find the mean of 1.00, 10.10, 0.05, 0.05, 0.05.
12
Find the mean of 2.80, 6.00, 1.85, 0.05, 0.05.
13
Find the mean of 4.10, 7.75, 0.05, 0.05, 0.05.
14
Find the mean of 11.30, 0.05, 0.05, 0.05, 0.05.
15
Find the mean of 12.05, 0.05, 0.05, 0.05, 0.05.
16
Find the mean of 11.80, 0.05, 0.05, 0.05, 0.05.
17
Find the mean of 0.50, 0.85, 9.55, 0.05, 0.05.
18
Find the mean of 10.80, 0.05, 0.05, 0.05, 0.05.
19
Find the mean of 11.55, 0.05, 0.05, 0.05, 0.05.
20
Find the mean of 10.55, 0.05, 0.05, 0.05, 0.05.

What is in this set

The numbers in this set run from 0.05 to 12.05.
Every problem in it will average values that are decimals.
A careful solution takes 6 written steps on average.
The mistake this set invites most often, in 100% of the problems: that is the total of all 5 values.
Answers are a decimal.

Drawing 240 problems from this page produced 131 different ones, 55% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.

The same skill, harder or easier

We would put this in front of a grade 6 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.