E-49
x
–
=
t
R
x
–
=
60
.
4
σx =
t
p
σx=
16
.
48757108
x
=
35
P(t)
?
N
2
35
N
1
)
=
0
.
061713
x
=
75
Q(t)
?
N
3
75
N
1
)
=
0
.
312061
x
=
85
R(t)
?
N
4
85
N
1
)
=
0
.
067845
t
=
1.5
R(t)
?
N
4
1
.
5
)
=
0
.
066807
DRILL MODE
Math Drill:
b
2
0
Math operation questions with positive integers and
0 are displayed randomly. It is possible to select the
number of questions and operator type.
Multiplication Table (
× Table): b 2 1
Questions from each row of the multiplication table (1
to 12) are displayed serially or randomly.
To exit DRILL mode, press
b
and select another mode.
Using Math Drill and × Table
1. Press
b
2
0
for Math Drill or
b
2
1
for
× Table.
2. Math Drill: Use
u
and
d
to select the number
of questions (25, 50, or 100).
× Table: Use
u
and
d
to select a row in the
multiplication table (1 to 12).
3. Math Drill: Use
l
and
r
to select the
operator type for questions (
+, −, ×, ÷, or +−×÷).
× Table: Use
l
and
r
to select the order
type (“Serial” or “Random”).
4. Press
e
to start.
When using Math Drill or
× Table (random order
only), questions are randomly selected and will not
repeat except by chance.