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Mathematics
Problem
The daily sales (in dozens of pastries) of a bakery over 10 days are given in the table. Class mark
(
x
)
(x)
(
x
)
: 10 20 30 40 Frequency
(
f
)
(f)
(
f
)
: 2 3 4 1 What is the variance of the sales (in dozens
2
^{2}
2
)? a) 85 b) 84 c) 93.3 d) 58.4
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