1. Bell work: *ACT Aspire Sample Question
Nigel’s class placed 10 empty rain gauges on the playground Monday morning. The line plot below shows the number of inches of rainwater in each gauge after it rained Monday afternoon.
Number of Inches of Rainwater
x x
x x x
x x x x x
3/ / /8 3/ /8
What is the mean amount of rainwater per gauge, in inches, in the 10 rain gauges?

2. What is the mean amount of rainwater per gauge, in inches, in the 10 rain gauges?
B. 5/8
C. 51/80
D. 37/56
E. 51/8
Answer: C

3. Mean absolute deviation
Measures the average amount that the items of a data set differ from the mean of the set.
Find the mean
Find the difference of each value from the mean
Subtract the smaller value from the larger value, so each difference is positive
Find the mean absolute deviation by averaging the differences

4. Hours worked on a Saturday: 4, 5, 7, 12
Mean = ( )/ 4 = 7
Deviations from the mean =
3, 2 , 0, 5
Mean absolute deviation =
( )/4 = 10/4 = 2.5