If the teacher adds 4 points to Test 4, Anthony’s average grade is 12.
³
Problem
The table below gives the results of a braking test.
Test No.
1
2
3
4
Speed (kph)
33
49
65
79
Braking distance (m)
5.30
14.45
20.21
38.45
Use the relationship between speed and braking distance to estimate the braking
distance required for a vehicle travelling at 55 kph.
A hand-drawn scatter plot of these data points suggest a linear relationship. The
calculator uses the least squares method to find the line of best fit,
y
'=
ax
'+
b
, for data
entered in lists.
v v $ $ $
<
33
$
49
$
65
$
79
$ "
5.3
$
14.45
$
20.21
$
38.45
<
% s
% u
3
(Selects
2-VAR STATS
)
$ $ $
<
Press
$
as necessary to view
a
and
b
.
This line of best fit,
y
'=0.67732519
x
'
N
18.66637321 models the linear trend of the data.
Press
$
until y' is highlighted.
Math Functions
37
