Calculating Averages
ISEE Middle Level Quantitative Reasoning · Flashcards · Recall
ISEE MIDDLE LEVEL QUANTITATIVE REASONING · FLASHCARDS
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QUESTION
State the formula for the arithmetic mean of
n
n
n
numbers
x
1
,
x
2
,
…
,
x
n
x_1, x_2, \dots, x_n
x
1
,
x
2
,
…
,
x
n
.
QUESTION
State the formula for a weighted mean with values
x
i
x_i
x
i
and weights
w
i
w_i
w
i
.
QUESTION
State the mean of two numbers
a
a
a
and
b
b
b
using a formula.
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ANSWER
a
+
b
2
\frac{a+b}{2}
2
a
+
b
. The mean of two numbers is their sum divided by
2
2
2
.
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